• Uboot

    目录

    ​编辑

    一、何为uboot？

    二、Uboot获取

    三、为什么要移植uboot？

    四、正点原子官方uboot编译

    1、编译UBOOT的时候需要先配置

    五、通过imxdownload软件烧录bin文件到sd卡

    一、何为uboot？

    1、uboot是一个裸机程序，比较复杂。

    2、uboot就是一个bootloader，作用就是用于启动Linux或其他系统。Uboot最主要的工作就是初始化DDR。因为Linux是运行在DDR里面的。一般Linux镜像zImage(uImage)+设备树(.dtb)存放在SD、EMMC、NAND、SPI FLASH等等外置存储区域。

           这里就牵扯到一个问题，需要将Linux镜像从外置flash拷贝到DDR中，再去启动。

           Uboot的主要目的就是为系统的启动做准备。

           Uboot不仅仅能启动Linux，也可以启动其他系统，比如vxworks。

           Linux不仅仅能通过uboot启动。

           Uboot是个通用的bootloader，他支持多种架构。

    二、Uboot获取

           1、首先就是uboot官网。缺点就是支持少，比如某一款具体芯片驱动等不完善。

           2、SOC厂商会从uboot官网下载某一个版本的uboot，然后在这个版本的uboot上加入相应的SOC以及驱动。这就是SOC厂商定制版的uboot。NXP官方的I.MX6ULL EVK板子，

           3、做开发板的厂商，开发板会参考SOC厂商的板子。开发板必然会和官方的板子不一样。因此开发板厂商又会去修改SOC厂商做好的uboot，以适应自己的板子。

    1. U-Boot 2016.03-gee88051 (Nov 05 2021 - 17:59:02 +0800)//uboot的版本
    2.  
    3. CPU:   Freescale i.MX6ULL rev1.1 792 MHz (running at 396 MHz)
    4. CPU:   Industrial temperature grade (-40C to 105C) at 44C
    5. Reset cause: POR
    6. Board: I.MX6U ALPHA|MINI
    7. I2C:   ready
    8. DRAM:  512 MiB
    9. MMC:   FSL_SDHC: 0, FSL_SDHC: 1         //相关硬件配置信息
    10. *** Warning - bad CRC, using default environment
    11.  
    12. In:    serial
    13. Out:   serial
    14. Err:   serial
    15. switch to partitions #0, OK
    16. mmc1(part 0) is current device
    17. Net:   FEC1
    18. Error: FEC1 address not set.
    19.  
    20. Normal Boot
    21. Hit any key to stop autoboot:  0    //在倒计时的3s内按键盘上的任意键就会进入uboot模式
    22. switch to partitions #0, OK
    23. mmc1(part 0) is current device
    24. switch to partitions #0, OK
    25. mmc1(part 0) is current device
    26. reading boot.scr                //读取boot.src
    27. ** Unable to read file boot.scr **
    28. reading zImage                    //读取镜像
    29. 6785568 bytes read in 225 ms (28.8 MiB/s)
    30. Booting from mmc ...
    31. reading imx6ull-14x14-emmc-7-1024x600-c.dtb    //读取设备树
    32. 39299 bytes read in 20 ms (1.9 MiB/s)
    33. Kernel image @ 0x80800000 [ 0x000000 - 0x678a20 ]
    34. ## Flattened Device Tree blob at 83000000
    35.    Booting using the fdt blob at 0x83000000
    36.    Using Device Tree in place at 83000000, end 8300c982
    37.  
    38. Starting kernel ...        //开始启动内核
    39.  
    40. [    0.000000] Booting Linux on physical CPU 0x0
    41. [    0.000000] Linux version 4.1.15-gb8dc0d4 (alientek@ubuntu) (gcc version 5.3.0 (GCC) ) #1 SMP PREEMPT Fri JulST 2022
    42. [    0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c53c7d
    43. [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
    44. [    0.000000] Machine model: Freescale i.MX6 ULL 14x14 EVK Board
    45. [    0.000000] Reserved memory: created CMA memory pool at 0x98000000, size 128 MiB
    46. [    0.000000] Reserved memory: initialized node linux,cma, compatible id shared-dma-pool
    47. [    0.000000] Memory policy: Data cache writealloc
    48. [    0.000000] PERCPU: Embedded 12 pages/cpu @97b8f000 s16780 r8192 d24180 u49152
    49. [    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 130048
    50. [    0.000000] Kernel command line: console=ttymxc0,115200 root=/dev/mmcblk1p2 rootwait rw
    51. [    0.000000] PID hash table entries: 2048 (order: 1, 8192 bytes)
    52. [    0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
    53. [    0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
    54. [    0.000000] Memory: 375264K/524288K available (8552K kernel code, 449K rwdata, 2964K rodata, 528K init, 452K served, 131072K cma-reserved, 0K highmem)
    55. [    0.000000] Virtual kernel memory layout:
    56. [    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
    57. [    0.000000]     fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
    58. [    0.000000]     vmalloc : 0xa0800000 - 0xff000000   (1512 MB)
    59. [    0.000000]     lowmem  : 0x80000000 - 0xa0000000   ( 512 MB)
    60. [    0.000000]     pkmap   : 0x7fe00000 - 0x80000000   (   2 MB)
    61. [    0.000000]     modules : 0x7f000000 - 0x7fe00000   (  14 MB)
    62. [    0.000000]       .text : 0x80008000 - 0x80b47284   (11517 kB)
    63. [    0.000000]       .init : 0x80b48000 - 0x80bcc000   ( 528 kB)
    64. [    0.000000]       .data : 0x80bcc000 - 0x80c3c7e0   ( 450 kB)
    65. [    0.000000]        .bss : 0x80c3f000 - 0x80cb00c4   ( 453 kB)
    66. [    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
    67. [    0.000000] Preemptible hierarchical RCU implementation.
    68. [    0.000000]  Additional per-CPU info printed with stalls.
    69. [    0.000000]  RCU restricting CPUs from NR_CPUS=4 to nr_cpu_ids=1.
    70. [    0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
    71. [    0.000000] NR_IRQS:16 nr_irqs:16 16
    72. [    0.000000] mxc_clocksource_init 3000000
    73. [    0.000000] Switching to timer-based delay loop, resolution 333ns
    74. [    0.000015] sched_clock: 32 bits at 3000kHz, resolution 333ns, wraps every 715827882841ns
    75. [    0.000057] clocksource mxc_timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 637086815595 ns
    76. [    0.002910] Console: colour dummy device 80x30
    77. [    0.002951] Calibrating delay loop (skipped), value calculated using timer frequency.. 6.00 BogoMIPS (lpj=300
    78. [    0.002985] pid_max: default: 32768 minimum: 301
    79. [    0.003213] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
    80. [    0.003246] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
    81. [    0.004624] CPU: Testing write buffer coherency: ok
    82. [    0.005114] /cpus/cpu@0 missing clock-frequency property
    83. [    0.005155] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
    84. [    0.005263] Setting up static identity map for 0x80008280 - 0x800082d8
    85. [    0.041180] Brought up 1 CPUs
    86. [    0.041218] SMP: Total of 1 processors activated (6.00 BogoMIPS).
    87. [    0.041237] CPU: All CPU(s) started in SVC mode.
    88. [    0.042352] devtmpfs: initialized
    89. [    0.059425] device-tree: Duplicate name in lcdif@021c8000, renamed to "display#1"
    90. [    0.066063] VFP support v0.3: implementor 41 architecture 2 part 30 variant 7 rev 5
    91. [    0.066987] clocksource jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
    92. [    0.077046] pinctrl core: initialized pinctrl subsystem
    93. [    0.079778] NET: Registered protocol family 16
    94. [    0.097565] DMA: preallocated 256 KiB pool for atomic coherent allocations
    95. [    0.121496] cpuidle: using governor ladder
    96. [    0.151559] cpuidle: using governor menu
    97. [    0.202225] hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers.
    98. [    0.202261] hw-breakpoint: maximum watchpoint size is 8 bytes.
    99. [    0.206734] imx6ul-pinctrl 20e0000.iomuxc: initialized IMX pinctrl driver
    100. [    0.207554] imx6ul-pinctrl 2290000.iomuxc-snvs: initialized IMX pinctrl driver
    101. [    0.279429] mxs-dma 1804000.dma-apbh: initialized
    102. [    0.286624] SCSI subsystem initialized
    103. [    0.287970] usbcore: registered new interface driver usbfs
    104. [    0.288170] usbcore: registered new interface driver hub
    105. [    0.288386] usbcore: registered new device driver usb
    106. [    0.291053] i2c i2c-0: IMX I2C adapter registered
    107. [    0.291102] i2c i2c-0: can't use DMA
    108. [    0.293473] i2c i2c-1: IMX I2C adapter registered
    109. [    0.293521] i2c i2c-1: can't use DMA
    110. [    0.293864] Linux video capture interface: v2.00
    111. [    0.294069] pps_core: LinuxPPS API ver. 1 registered
    112. [    0.294093] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti 
    113. [    0.294170] PTP clock support registered
    114. [    0.297194] MIPI CSI2 driver module loaded
    115. [    0.297907] Advanced Linux Sound Architecture Driver Initialized.
    116. [    0.300138] Bluetooth: Core ver 2.20
    117. [    0.300268] NET: Registered protocol family 31
    118. [    0.300293] Bluetooth: HCI device and connection manager initialized
    119. [    0.300334] Bluetooth: HCI socket layer initialized
    120. [    0.300369] Bluetooth: L2CAP socket layer initialized
    121. [    0.300451] Bluetooth: SCO socket layer initialized
    122. [    0.303124] Switched to clocksource mxc_timer1
    123. [    0.330145] NET: Registered protocol family 2
    124. [    0.331747] TCP established hash table entries: 4096 (order: 2, 16384 bytes)
    125. [    0.331881] TCP bind hash table entries: 4096 (order: 3, 32768 bytes)
    126. [    0.332041] TCP: Hash tables configured (established 4096 bind 4096)
    127. [    0.332179] UDP hash table entries: 256 (order: 1, 8192 bytes)
    128. [    0.332242] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
    129. [    0.332670] NET: Registered protocol family 1
    130. [    0.333514] RPC: Registered named UNIX socket transport module.
    131. [    0.333547] RPC: Registered udp transport module.
    132. [    0.333567] RPC: Registered tcp transport module.
    133. [    0.333587] RPC: Registered tcp NFSv4.1 backchannel transport module.
    134. [    0.337087] imx rpmsg driver is registered.
    135. [    0.339953] Bus freq driver module loaded
    136. [    0.342168] futex hash table entries: 256 (order: 2, 16384 bytes)
    137. [    0.359310] VFS: Disk quotas dquot_6.6.0
    138. [    0.359824] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
    139. [    0.365608] NFS: Registering the id_resolver key type
    140. [    0.365754] Key type id_resolver registered
    141. [    0.365776] Key type id_legacy registered
    142. [    0.365993] jffs2: version 2.2. (NAND) © 2001-2006 Red Hat, Inc.
    143. [    0.367921] fuse init (API version 7.23)
    144. [    0.379023] io scheduler noop registered
    145. [    0.379073] io scheduler deadline registered
    146. [    0.379583] io scheduler cfq registered (default)
    147. [    0.380735] imx-weim 21b8000.weim: Driver registered.
    148. [    0.387620] backlight supply power not found, using dummy regulator
    149. [    0.388940] MIPI DSI driver module loaded
    150. [    0.389464] MIPI DSI driver module loaded
    151. [    0.395694] 21c8000.lcdif supply lcd not found, using dummy regulator
    152. [    0.503633] mxsfb 21c8000.lcdif: failed to find mxc display driver
    153. [    0.518048] Console: switching to colour frame buffer device 128x37
    154. [    0.554389] mxsfb 21c8000.lcdif: initialized
    155. [    0.556513] imx-sdma 20ec000.sdma: no event needs to be remapped
    156. [    0.556730] imx-sdma 20ec000.sdma: loaded firmware 3.3
    157. [    0.564200] imx-sdma 20ec000.sdma: initialized
    158. [    0.566479] 2020000.serial: ttymxc0 at MMIO 0x2020000 (irq = 19, base_baud = 5000000) is a IMX
    159. [    1.254651] console [ttymxc0] enabled
    160. [    1.260311] 21ec000.serial: ttymxc2 at MMIO 0x21ec000 (irq = 233, base_baud = 5000000) is a IMX
    161. [    1.358946] imx-rng 2284000.rngb: iMX RNG Registered.
    162. [    1.364834] imx sema4 driver is registered.
    163. [    1.369216] [drm] Initialized drm 1.1.0 20060810
    164. [    1.375259] [drm] Initialized vivante 1.0.0 20120216 on minor 0
    165. [    1.407140] brd: module loaded
    166. [    1.423336] loop: module loaded
    167. [    1.431955] fsl-quadspi 21e0000.qspi: unrecognized JEDEC id bytes: ff, ff, ff
    168. [    1.439334] fsl-quadspi 21e0000.qspi: Freescale QuadSPI probe failed
    169. [    1.451945] spi_imx 2010000.ecspi: probed
    170. [    1.458933] CAN device driver interface
    171. [    1.466008] flexcan 2090000.can: device registered (reg_base=a0a08000, irq=26)
    172. [    1.475703] 20b4000.ethernet supply phy not found, using dummy regulator
    173. [    1.684329] pps pps0: new PPS source ptp0
    174. [    1.689949] fec 20b4000.ethernet (unnamed net_device) (uninitialized): Invalid MAC address: 00:00:00:00:00:00
    175. [    1.700091] fec 20b4000.ethernet (unnamed net_device) (uninitialized): Using random MAC address: 5e:a8:0d:76:
    176. [    1.711455] libphy: fec_enet_mii_bus: probed
    177. [    1.719950] fec 20b4000.ethernet eth0: registered PHC device 0
    178. [    1.727748] 2188000.ethernet supply phy not found, using dummy regulator
    179. [    1.944205] pps pps1: new PPS source ptp1
    180. [    1.949757] fec 2188000.ethernet (unnamed net_device) (uninitialized): Invalid MAC address: 00:00:00:00:00:00
    181. [    1.959893] fec 2188000.ethernet (unnamed net_device) (uninitialized): Using random MAC address: d2:79:f3:dd:
    182. [    1.972484] fec 2188000.ethernet eth1: registered PHC device 1
    183. [    1.980204] PPP generic driver version 2.4.2
    184. [    1.985209] PPP BSD Compression module registered
    185. [    1.989969] PPP Deflate Compression module registered
    186. [    1.995173] PPP MPPE Compression module registered
    187. [    2.000025] NET: Registered protocol family 24
    188. [    2.004823] usbcore: registered new interface driver asix
    189. [    2.010415] usbcore: registered new interface driver ax88179_178a
    190. [    2.016787] usbcore: registered new interface driver cdc_ether
    191. [    2.022807] usbcore: registered new interface driver net1080
    192. [    2.028704] usbcore: registered new interface driver cdc_subset
    193. [    2.034836] usbcore: registered new interface driver zaurus
    194. [    2.040689] usbcore: registered new interface driver cdc_ncm
    195. [    2.046553] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
    196. [    2.053180] ehci-mxc: Freescale On-Chip EHCI Host driver
    197. [    2.059037] usbcore: registered new interface driver usb-storage
    198. [    2.065319] usbcore: registered new interface driver usb_ehset_test
    199. [    2.074550] 2184800.usbmisc supply vbus-wakeup not found, using dummy regulator
    200. [    2.083914] 2184000.usb supply vbus not found, using dummy regulator
    201. [    2.096030] ci_hdrc ci_hdrc.0: EHCI Host Controller
    202. [    2.100992] ci_hdrc ci_hdrc.0: new USB bus registered, assigned bus number 1
    203. [    2.123260] ci_hdrc ci_hdrc.0: USB 2.0 started, EHCI 1.00
    204. [    2.130840] hub 1-0:1.0: USB hub found
    205. [    2.134934] hub 1-0:1.0: 1 port detected
    206. [    2.140799] 2184200.usb supply vbus not found, using dummy regulator
    207. [    2.151259] ci_hdrc ci_hdrc.1: EHCI Host Controller
    208. [    2.156392] ci_hdrc ci_hdrc.1: new USB bus registered, assigned bus number 2
    209. [    2.183275] ci_hdrc ci_hdrc.1: USB 2.0 started, EHCI 1.00
    210. [    2.190944] hub 2-0:1.0: USB hub found
    211. [    2.194998] hub 2-0:1.0: 1 port detected
    212. [    2.201672] mousedev: PS/2 mouse device common for all mice
    213. [    2.209404] input: 20cc000.snvs:snvs-powerkey as /devices/platform/soc/2000000.aips-bus/20cc000.snvs/20cc000.rkey/input/input0
    214. [    2.513196] usb 2-1: new high-speed USB device number 2 using ci_hdrc
    215. [    2.562665] input: EP0790M09 as /devices/platform/soc/2100000.aips-bus/21a4000.i2c/i2c-1/1-0038/input/input1
    216. [    2.574825] <<-GTP-INFO->> GTP driver installing...
    217. [    2.580465] <<-GTP-INFO->> GTP Driver Version: gt9xx driver Rleased <2021/11/27> Based V2.4
    218. [    2.589020] <<-GTP-INFO->> GTP I2C Address: 0x5d
    219. [    2.593767] <<-GTP-ERROR->> Failed to request GPIO:9, ERRNO:-16
    220. [    2.599713] <<-GTP-ERROR->> GTP request IO port failed.
    221. [    2.609176] snvs_rtc 20cc000.snvs:snvs-rtc-lp: rtc core: registered 20cc000.snvs:snvs-r as rtc0
    222. [    2.618376] i2c /dev entries driver
    223. [    2.624781] IR NEC protocol handler initialized
    224. [    2.629373] IR RC5(x/sz) protocol handler initialized
    225. [    2.634642] IR RC6 protocol handler initialized
    226. [    2.639359] IR JVC protocol handler initialized
    227. [    2.644034] IR Sony protocol handler initialized
    228. [    2.648718] IR SANYO protocol handler initialized
    229. [    2.653505] IR Sharp protocol handler initialized
    230. [    2.658270] IR MCE Keyboard/mouse protocol handler initialized
    231. [    2.664255] IR XMP protocol handler initialized
    232. [    2.672236] hub 2-1:1.0: USB hub found
    233. [    2.678641] pxp-v4l2 pxp_v4l2: initialized
    234. [    2.682906] hub 2-1:1.0: 4 ports detected
    235. [    2.690877] imx2-wdt 20bc000.wdog: use WDOG_B to reboot.
    236. [    2.698704] imx2-wdt 20bc000.wdog: timeout 60 sec (nowayout=0)
    237. [    2.706015] Bluetooth: HCI UART driver ver 2.3
    238. [    2.710506] Bluetooth: HCI UART protocol H4 registered
    239. [    2.715769] Bluetooth: HCI UART protocol BCSP registered
    240. [    2.721114] Bluetooth: HCI UART protocol ATH3K registered
    241. [    2.726855] usbcore: registered new interface driver bcm203x
    242. [    2.732741] usbcore: registered new interface driver btusb
    243. [    2.738616] usbcore: registered new interface driver ath3k
    244. [    2.745321] sdhci: Secure Digital Host Controller Interface driver
    245. [    2.751543] sdhci: Copyright(c) Pierre Ossman
    246. [    2.756036] sdhci-pltfm: SDHCI platform and OF driver helper
    247. [    2.764385] /soc/aips-bus@02100000/usdhc@02190000: voltage-ranges unspecified
    248. [    2.771622] sdhci-esdhc-imx 2190000.usdhc: Got CD GPIO
    249. [    2.779065] sdhci-esdhc-imx 2190000.usdhc: No vqmmc regulator found
    250. [    2.834682] mmc0: SDHCI controller on 2190000.usdhc [2190000.usdhc] using ADMA
    251. [    2.851325] /soc/aips-bus@02100000/usdhc@02194000: voltage-ranges unspecified
    252. [    2.865062] sdhci-esdhc-imx 2194000.usdhc: No vmmc regulator found
    253. [    2.873461] sdhci-esdhc-imx 2194000.usdhc: No vqmmc regulator found
    254. [    2.933235] mmc1: SDHCI controller on 2194000.usdhc [2194000.usdhc] using ADMA
    255. [    2.953957] usbcore: registered new interface driver usbhid
    256. [    2.959576] usbhid: USB HID core driver
    257. [    2.972755] mmc0: host does not support reading read-only switch, assuming write-enable
    258. [    2.987918] mmc0: new high speed SDHC card at address 0001
    259. [    2.998109] fsl-asrc 2034000.asrc: driver registered
    260. [    3.003420] mmcblk0: mmc0:0001 SD16G 7.48 GiB
    261. [    3.015731]  mmcblk0: p1 p2
    262. [    3.028202] imx-wm8960 sound: wm8960-hifi <-> 202c000.sai mapping ok
    263. [    3.047891] imx-wm8960 sound: snd-soc-dummy-dai <-> 2034000.asrc mapping ok
    264. [    3.058431] imx-wm8960 sound: wm8960-hifi <-> 202c000.sai mapping ok
    265. [    3.128161] mmc1: MAN_BKOPS_EN bit is not set
    266. [    3.173669] mmc1: new HS200 MMC card at address 0001
    267. [    3.179775] mmcblk1: mmc1:0001 8GTF4R 7.28 GiB
    268. [    3.184801] mmcblk1boot0: mmc1:0001 8GTF4R partition 1 4.00 MiB
    269. [    3.191064] mmcblk1boot1: mmc1:0001 8GTF4R partition 2 4.00 MiB
    270. [    3.197403] mmcblk1rpmb: mmc1:0001 8GTF4R partition 3 512 KiB
    271. [    3.211262] NET: Registered protocol family 26
    272. [    3.217147]  mmcblk1: p1 p2
    273. [    3.222255] NET: Registered protocol family 10
    274. [    3.235031] sit: IPv6 over IPv4 tunneling driver
    275. [    3.241370] NET: Registered protocol family 17
    276. [    3.246275] bridge: automatic filtering via arp/ip/ip6tables has been deprecated. Update your scripts to loadif you need this.
    277. [    3.259084] can: controller area network core (rev 20120528 abi 9)
    278. [    3.265564] NET: Registered protocol family 29
    279. [    3.270100] can: raw protocol (rev 20120528)
    280. [    3.274585] can: broadcast manager protocol (rev 20120528 t)
    281. [    3.280315] can: netlink gateway (rev 20130117) max_hops=1
    282. [    3.286604] Bluetooth: RFCOMM TTY layer initialized
    283. [    3.291553] Bluetooth: RFCOMM socket layer initialized
    284. [    3.296966] Bluetooth: RFCOMM ver 1.11
    285. [    3.300794] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
    286. [    3.306196] Bluetooth: BNEP filters: protocol multicast
    287. [    3.311478] Bluetooth: BNEP socket layer initialized
    288. [    3.316533] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
    289. [    3.322497] Bluetooth: HIDP socket layer initialized
    290. [    3.327678] 8021q: 802.1Q VLAN Support v1.8
    291. [    3.332048] Key type dns_resolver registered
    292. [    3.361888] dhd_module_init in
    293. [    3.366555] input: gpio_keys@0 as /devices/platform/gpio_keys@0/input/input2
    294. [    3.374341] snvs_rtc 20cc000.snvs:snvs-rtc-lp: setting system clock to 2021-08-03 02:01:46 UTC (1627956106)
    295. [    3.397786] gpio_dvfs: disabling
    296. [    3.401060] can-3v3: disabling
    297. [    3.404482] ALSA device list:
    298. [    3.407472]   #0: wm8960-audio
    299. [    3.584681] kjournald starting.  Commit interval 5 seconds
    300. [    3.584827] EXT3-fs (mmcblk1p2): using internal journal
    301. [    3.595889] EXT3-fs (mmcblk1p2): 1 orphan inode deleted
    302. [    3.606318] EXT3-fs (mmcblk1p2): recovery complete
    303. [    3.611137] EXT3-fs (mmcblk1p2): mounted filesystem with ordered data mode
    304. [    3.618178] VFS: Mounted root (ext3 filesystem) on device 179:10.
    305. [    3.625029] devtmpfs: mounted
    306. [    3.628702] Freeing unused kernel memory: 528K (80b48000 - 80bcc000)
    307. INIT: version 2.88 booting
    308. Starting udev
    309. [    4.268890] udevd[131]: starting version 3.1.5
    310. [    4.282029] random: udevd urandom read with 33 bits of entropy available
    311. bootlogd: cannot allocate pseudo tty: No such file or directory
    312. [    5.279276] 1-003c supply DOVDD not found, using dummy regulator
    313. [    5.383246] 1-003c supply DVDD not found, using dummy regulator
    314. [    5.389268] 1-003c supply AVDD not found, using dummy regulator
    315. [    5.563593] ov5640_read_reg:write reg error:reg=300a
    316. [    5.590944] camera ov5640 is not found
    317. [    7.919422] kjournald starting.  Commit interval 5 seconds
    318. [    7.944909] EXT3-fs (mmcblk0p2): using internal journal
    319. [    7.950175] EXT3-fs (mmcblk0p2): recovery complete
    320. [    8.073644] EXT3-fs (mmcblk0p2): mounted filesystem with ordered data mode
    321. [    8.086801] FAT-fs (mmcblk1p1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
    322. [    8.107279] FAT-fs (mmcblk0p1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
    323. ALSA: Restoring mixer settings...
    324. INIT: Entering runlevel: 5
    325. Configuring network interfaces... [    9.353895] fec 20b4000.ethernet eth0: Freescale FEC PHY driver [SMSC LAN87ii_bus:phy_addr=20b4000.ethernet:01, irq=-1)
    326. [    9.393247] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
    327. done.
    328. Starting system message bus: dbus.
    329. Starting Xserver
    330. Starting Connection Manager
    331. Starting Dropbear SSH server: dropbear.
    332. Starting rpcbind daemon...done.
    333. [   10.503908] fec 2188000.ethernet eth1: Freescale FEC PHY driver [SMSC LAN8710/LAN8720] (mii_bus:phy_addr=20b40, irq=-1)
    334. [   10.553487] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready
    335. starting statd: done
    336. Starting advanced power management daemon: apmd.
    337. apmd[626]: apmd 3.2.1 interfacing with apm driver 1.13 and APM BIOS 1.2
    338. Starting atd: OK
    339. exportfs: can't open /etc/exports for reading
    340. NFS daemon support not enabled in kernel
    341. Starting system log daemon...0
    342. Starting kernel log daemon...0
    343.  * Starting Avahi mDNS/DNS-SD Daemon: avahi-daemon                       [ ok ]
    344. Starting Telephony daemon
    345. Starting Linux NFC daemon
    346. * starting FTP Server: vsftpd... done.
    347. Starting crond: OK
    348. Starting nginx: nginx.
    349. Running local boot scripts (/etc/rc.local).
    351. root@ATK-IMX6U:~# [   16.679559] ICM20608 ID = 0XAE
    352. [   19.726082] random: nonblocking pool is initialized

    三、为什么要移植uboot？

    uboot的下载可以到官方网站下载，这里面的uboot是原汁原味的源码，但我们肯定不用源码的uboot进行学习，芯片厂商会采用源码uboot进行芯片的移植，也就是说芯片厂商会自己维护一个版本的uboot，这个版本是他们自己定制的，（虽然uboot 官网的源码中一般也会支持他们的芯片，但是绝对是没有半导体厂商自己维护的 uboot 全面），如果我们一开会就拿源码uboot进行学习的话难度太大，因为用的板子是6ull，为nxp公司的芯片，所以我们直接在nxp官网下载器uboot版本进行配套学习就好了，如下：

     图中uboot 基本支持了 NXP 当前所有可以跑 Linux 的芯片，而且支持各种启动方式，比如 EMMC、NAND、 NOR FLASH 等等，这些都是 uboot 官方所不支持的。他们三者的关系如下：

     他们就是一环接一环，一环比一环更加二次开发，更加支持自家产品、切合实际使用！

            那么这三种 uboot 该如何选择呢？首先 uboot 官方的基本是不会用的，因为支持太弱了。
    最常用的就是半导体厂商或者开发板厂商的 uboot，如果你用的半导体厂商的评估板，那么就使
    用半导体厂商的 uboot，如果你是购买的第三方开发板，比如正点原子的 I.MX6ULL 开发板，
    那么就使用正点原子提供的 uboot 源码（也是在半导体厂商的 uboot 上修改的）。当然了，你也
    可以在购买了第三方开发板以后使用半导体厂商提供的 uboot， 只不过有些外设驱动可能不支
    持， 需要自己移植， 这个就是我们常说的 uboot 移植。

    四、正点原子官方uboot编译

    1、编译UBOOT的时候需要先配置

           1、编译完成以后就会生成一个u-boot.bin。必须向u-boot.bin添加头部信息。Uboot编译最后会通过/tools/mkimage软件添加头部信息，生成u-boot.imx。

           3、如果配置过uboot，那么一定要注意shell脚本会清除整个工程，那么配置的文件也会被删除，配置项也会被删除掉。

           4、为了方便开发，建议直接在uboot顶层Makefile里面设置好ARCH和CORSS_COMPILE这两个变量的值。

    也就是执行下面这三条命令 

    最后将成的uboot.imx文件通过mfgtool烧录到6ull就可以直线uboot的烧录了。

     可以看出时间已经改变，说明烧录成功。

    五、通过imxdownload软件烧录bin文件到sd卡

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  • 原文地址：https://blog.csdn.net/qq_43482790/article/details/126067907