• EMMC打印cqhci: timeout for tag 10提示分析与解决

            mt2735 5G模块外挂海力士 8G EMMC，启动提示读取数据失败进行分析。 

    启动打印

    EMMC驱动时钟初始化打印：

    1. [    3.977929] <1>.(1)[1:swapper/0]mtk-msdc 11230000.mmc: Linked as a consumer to regulator.27
    2. [    3.979343] <1>.(1)[1:swapper/0]mmc0: CQHCI version 5.10
    3. [    3.981926] <1>.(1)[1:swapper/0]mtk-msdc 11230000.mmc: init hardware done!
    4. [    3.984383] <1>.(1)[1:swapper/0]mtk-msdc 11230000.mmc: init hardware done!
    5. [    3.996084] <1>.(1)[1:swapper/0]mtk-msdc 11230000.mmc: host->mclk:0, ios->clock:400000, host->timing:0,ios->timing:0
    6. [    3.997531] <2>.(2)[1:swapper/0]mtk-msdc 11230000.mmc: sclk: 399999, timing: 0, hz: 400000
    7. [    4.015348] <2>.(2)[1:swapper/0]mtk-msdc 11240000.mmc: Got CD GPIO
    8. [    4.017036] <2>.(2)[1:swapper/0]mtk-msdc 11240000.mmc: Linked as a consumer to regulator.33
    9. [    4.020145] <2>.(2)[1:swapper/0]mtk-msdc 11240000.mmc: init hardware done!
    10. [    4.035223] <2>.(2)[1:swapper/0]mtk-msdc 11240000.mmc: host->mclk:0, ios->clock:400000, host->timing:0,ios->timing:0
    11. [    4.036795] <2>.(2)[1:swapper/0]mtk-msdc 11240000.mmc: sclk: 399999, timing: 0, hz: 400000
    12. [    4.051228] <2>.(2)[2170:kworker/2:2]mtk-msdc 11240000.mmc: host->mclk:400000, ios->clock:0, host->timing:0,ios->timing:0
    13. [    4.052635] <2>.(2)[2170:kworker/2:2]mtk-msdc 11240000.mmc: set mclk to 0
    14.  
    15. [    4.104750] <2>.(2)[74:kworker/2:1]mtk-msdc 11230000.mmc: host->mclk:400000, ios->clock:400000, host->timing:0,ios->timing:9
    16. [    4.106295] <2>.(2)[74:kworker/2:1]mtk-msdc 11230000.mmc: sclk: 399999, timing: 9, hz: 400000
    17. [    4.107746] <2>.(2)[74:kworker/2:1]mtk-msdc 11230000.mmc: host->mclk:400000, ios->clock:200000000, host->timing:9,ios->timing:9
    18. [    4.109256] <2>.(2)[74:kworker/2:1]mtk-msdc 11230000.mmc: sclk: 191999939, timing: 9, hz: 200000000

    HS200和HS400模式探测打印： HS200和HS400模式都探测成功了。drivers/mmc/host/mediatek/autok.c

    1. [    4.077168] <0>.(0)[14:kworker/0:1][AUTOK]eMMC HS200 Tune
    2. [    4.084195] <2>.(0)[14:kworker/0:1][AUTOK]CMD 0 	 44 	 OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOXXOOOOOOOOOOOOOOOOOO
    3. [    4.088048] <0>.(0)[14:kworker/0:1][AUTOK]CMD 1 	 56 	 OOOOOOOXOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
    4. [    4.094483] <0>.(0)[14:kworker/0:1][AUTOK]Analysis Result: 1T = 74
    5. [    4.099475] <0>.(0)[14:kworker/0:1][AUTOK]dev status 0x00000900
    6. [    4.113842] <2>.(0)[14:kworker/0:1][AUTOK]DAT 0 	 39 	 OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOXXXXXXXXOOOOOOOOOOOOOOOOO
    7. [    4.123932] <0>.(0)[14:kworker/0:1][AUTOK]DAT 1 	 55 	 OOXXXXXXXOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
    8. [    4.125058] <0>.(0)[14:kworker/0:1][AUTOK]Analysis Result: 1T = 74
    9. [    4.129413] <2>.(0)[14:kworker/0:1][AUTOK]CMD [EDGE:0 CMD_FIFO_EDGE:0 DLY1:7 DLY2:0]
    10. [    4.139421] <2>.(0)[14:kworker/0:1][AUTOK]DAT [RDAT_EDGE:0 RD_FIFO_EDGE:0 WD_FIFO_EDGE:0]
    11. [    4.145125] <2>.(0)[14:kworker/0:1][AUTOK]DAT [LATCH_CK:0 DLY1:5 DLY2:0]
    12. [    4.148244] <2>.(0)[14:kworker/0:1][AUTOK]DS  [DLY1:0 DLY2:0 DLY3:0]
    13. [    4.151185] <2>.(0)[14:kworker/0:1][AUTOK]CLK TX  [0]
    14. [    4.154158] <2>.(0)[14:kworker/0:1][AUTOK]CMD TX  [0]
    15. [    4.154171] <2>.(0)[14:kworker/0:1][AUTOK]DAT TX  [D0:0 D1:0 D2:0 D3:0]
    16. [    4.157110] <2>.(0)[14:kworker/0:1][AUTOK]DAT TX  [D4:0 D5:0 D6:0 D7:0]
    17. [    4.160055] <0>.(0)[14:kworker/0:1][AUTOK][HS200]======Cost:82 ms======
    18.  
    19. [    4.187290] <3>.(2)[74:kworker/2:1]mtk-msdc 11230000.mmc: host->mclk:200000000, ios->clock:200000000, host->timing:9,ios->timing:1
    20. [    4.188971] <3>.(2)[74:kworker/2:1]mtk-msdc 11230000.mmc: sclk: 191999939, timing: 1, hz: 200000000
    21. [    4.193035] <3>.(2)[74:kworker/2:1]mtk-msdc 11230000.mmc: host->mclk:200000000, ios->clock:52000000, host->timing:1,ios->timing:1
    22. [    4.194632] <3>.(2)[74:kworker/2:1]mtk-msdc 11230000.mmc: sclk: 47999984, timing: 1, hz: 52000000
    23. [    4.198355] <3>.(2)[74:kworker/2:1]mtk-msdc 11230000.mmc: host->mclk:52000000, ios->clock:52000000, host->timing:1,ios->timing:10
    24. [    4.200224] <3>.(2)[74:kworker/2:1]mtk-msdc 11230000.mmc: sclk: 47999984, timing: 10, hz: 52000000
    25. [    4.203163] <3>.(2)[74:kworker/2:1]mtk-msdc 11230000.mmc: host->mclk:52000000, ios->clock:200000000, host->timing:10,ios->timing:10
    26. [    4.205782] <3>.(2)[74:kworker/2:1]mtk-msdc 11230000.mmc: sclk: 191999939, timing: 10, hz: 200000000
    27.  
    28. [    4.182371] <2>.(0)[14:kworker/0:1][AUTOK]eMMC HS400 Tune
    29. [    4.191612] <2>.(0)[14:kworker/0:1][AUTOK]CMD 0 	 44 	 OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOXXOOOOOOOOOOOOOOOOOO
    30. [    4.196469] <2>.(0)[14:kworker/0:1][AUTOK]CMD 1 	 57 	 OOOOOOXOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
    31. [    4.200044] <2>.(0)[14:kworker/0:1][AUTOK]Analysis Result: 1T = 76
    32. [    4.202067] <2>.(0)[14:kworker/0:1][AUTOK]device status 0x00000900
    33. [    9.431232] <0>.(0)[14:kworker/0:1][AUTOK]DLY1/2 0 	 0 	 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
    34. [    9.432691] <0>.(0)[14:kworker/0:1][AUTOK]CMD [EDGE:0 CMD_FIFO_EDGE:0 DLY1:6 DLY2:0]
    35. [    9.433721] <0>.(0)[14:kworker/0:1][AUTOK]DAT [RDAT_EDGE:0 RD_FIFO_EDGE:0 WD_FIFO_EDGE:0]
    36. [    9.434782] <0>.(0)[14:kworker/0:1][AUTOK]DAT [LATCH_CK:0 DLY1:0 DLY2:0]
    37. [    9.435656] <0>.(0)[14:kworker/0:1][AUTOK]DS  [DLY1:0 DLY2:0 DLY3:20]
    38. [    9.436497] <0>.(0)[14:kworker/0:1][AUTOK]CLK TX  [0]
    39. [    9.437161] <0>.(0)[14:kworker/0:1][AUTOK]CMD TX  [0]
    40. [    9.437826] <0>.(0)[14:kworker/0:1][AUTOK]DAT TX  [D0:0 D1:0 D2:0 D3:0]
    41. [    9.438688] <0>.(0)[14:kworker/0:1][AUTOK]DAT TX  [D4:0 D5:0 D6:0 D7:0]
    42. [    9.439571] <0>.(0)[14:kworker/0:1][AUTOK][HS400]======Cost:5251 ms======

    识别EMMC成功，海力士8G容量，但在后面读取分区数据信息报数据错误dat_err =-110，开始复位恢复：

    1. [    9.463002] <2>.(2)[74:kworker/2:1]mmc0: Command Queue Engine enabled
    2. [    9.463855] <2>.(2)[74:kworker/2:1]mmc0: new HS400 MMC card at address 0001
    3. [    9.468233] <2>.(2)[74:kworker/2:1]mmcblk0: mmc0:0001 H8G4a2 7.28 GiB 
    4. [    9.468233] <2>.(2)[74:kworker/2:1]mmcblk0: mmc0:0001 H8G4a2 7.28 GiB 
    5. [    9.470576] <2>.(2)[74:kworker/2:1]mmcblk0boot0: mmc0:0001 H8G4a2 partition 1 4.00 MiB
    6. [    9.470576] <2>.(2)[74:kworker/2:1]mmcblk0boot0: mmc0:0001 H8G4a2 partition 1 4.00 MiB
    7. [    9.473075] <2>.(2)[74:kworker/2:1]mmcblk0boot1: mmc0:0001 H8G4a2 partition 2 4.00 MiB
    8. [    9.473075] <2>.(2)[74:kworker/2:1]mmcblk0boot1: mmc0:0001 H8G4a2 partition 2 4.00 MiB
    9. [    9.474489] <2>.(2)[74:kworker/2:1]mmcblk0rpmb: mmc0:0001 H8G4a2 partition 3 4.00 MiB, chardev (234:0)
    10. [    9.474489] <2>.(2)[74:kworker/2:1]mmcblk0rpmb: mmc0:0001 H8G4a2 partition 3 4.00 MiB, chardev (234:0)
    11. [   10.176763] <0>-(0)[0:swapper/0]mtk-msdc 11230000.mmc: msdc_cmdq_irq: DATA TIMEOUT ERR
    12. [   10.177837] <0>-(0)[0:swapper/0]mtk-msdc 11230000.mmc: cmd_err = 0, dat_err =-110, intsts = 0x10004108
    13. [   10.179160] <0>.(0)[14:kworker/0:1]mmc0: running CQE recovery

    打印“mmc0: cqhci: timeout for tag 10”错误提示和寄存器信息，这里超时时间60秒：#define MMC_ERASE_TIMEOUT_MS    (60 * 1000) /* 60 s */

    1. [   74.716094] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: timeout for tag 10
    2. [   74.716989] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: ============ CQHCI REGISTER DUMP ===========
    3. [   74.718161] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: Caps:      0x000020b6 | Version:  0x00000510
    4. [   74.719331] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: Config:    0x00001101 | Control:  0x00000000
    5. [   74.720500] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: Int stat:  0x00000000 | Int enab: 0x00000006
    6. [   74.721670] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: Int sig:   0x00000006 | Int Coal: 0x00000000
    7. [   74.722838] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: TDL base:  0x7f047000 | TDL up32: 0x00000000
    8. [   74.724006] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: Doorbell:  0x00000400 | TCN:      0x00000000
    9. [   74.725174] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: Dev queue: 0x00000000 | Dev Pend: 0x00000400
    10. [   74.726433] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: Task clr:  0x00000000 | SSC1:     0x00001000
    11. [   74.727606] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: SSC2:      0x00000001 | DCMD rsp: 0x00000000
    12. [   74.728775] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: RED mask:  0xfdf9a080 | TERRI:    0x00000000
    13. [   74.729943] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: Resp idx:  0x0000000d | Resp arg: 0x00000000
    14. [   74.731108] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: : ===========================================
    15. [   74.732379] <2>.(2)[2417:kworker/2:3]mmc0: running CQE recovery

    最后报“print_req_error: I/O error, dev mmcblk0, sector 0”数据读取失败：

    1. [  136.157599] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: timeout for tag 10
    2. [  136.164661] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: ============ CQHCI REGISTER DUMP ===========
    3. [  136.165832] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: Caps:      0x000020b6 | Version:  0x00000510
    4. [  136.167153] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: Config:    0x00001101 | Control:  0x00000000
    5. [  136.168326] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: Int stat:  0x00000000 | Int enab: 0x00000006
    6. [  136.169495] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: Int sig:   0x00000006 | Int Coal: 0x00000000
    7. [  136.170665] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: TDL base:  0x7f047000 | TDL up32: 0x00000000
    8. [  136.171834] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: Doorbell:  0x00000400 | TCN:      0x00000000
    9. [  136.173003] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: Dev queue: 0x00000000 | Dev Pend: 0x00000400
    10. [  136.174172] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: Task clr:  0x00000000 | SSC1:     0x00001000
    11. [  136.175340] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: SSC2:      0x00000001 | DCMD rsp: 0x00000000
    12. [  136.176616] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: RED mask:  0xfdf9a080 | TERRI:    0x00000000
    13. [  136.177788] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: Resp idx:  0x0000000d | Resp arg: 0x00000000
    14. [  136.178955] <2>.(2)[2230:kworker/2:1H]mmc0: cqhci: : ===========================================
    15. [  136.180252] <2>.(2)[2417:kworker/2:3]mmc0: running CQE recovery
    16. [  136.181927] <2>.(2)[2417:kworker/2:3]print_req_error: I/O error, dev mmcblk0, sector 0
    17. [  136.183029] <2>.(2)[2417:kworker/2:3]Buffer I/O error on dev mmcblk0, logical block 0, async page read
    18. [  136.891855] <0>-(0)[0:swapper/0]mtk-msdc 11230000.mmc: msdc_cmdq_irq: DATA TIMEOUT ERR
    19. [  136.892967] <0>-(0)[0:swapper/0]mtk-msdc 11230000.mmc: cmd_err = 0, dat_err =-110, intsts = 0x10004108
    20. [  136.894396] <0>.(0)[2416:kworker/0:2]mmc0: running CQE recovery
    1. [  330.716949] <3>.(3)[2450:kworker/3:1H]mmc0: cqhci: timeout for tag 12
    2. [  330.724006] <3>.(3)[2450:kworker/3:1H]mmc0: cqhci: ============ CQHCI REGISTER DUMP ===========
    3. [  330.725177] <3>.(3)[2450:kworker/3:1H]mmc0: cqhci: Caps:      0x000020b6 | Version:  0x00000510
    4. [  330.726430] <3>.(3)[2450:kworker/3:1H]mmc0: cqhci: Config:    0x00001101 | Control:  0x00000000
    5. [  330.727606] <3>.(3)[2450:kworker/3:1H]mmc0: cqhci: Int stat:  0x00000000 | Int enab: 0x00000006
    6. [  330.728776] <3>.(3)[2450:kworker/3:1H]mmc0: cqhci: Int sig:   0x00000006 | Int Coal: 0x00000000
    7. [  330.729945] <3>.(3)[2450:kworker/3:1H]mmc0: cqhci: TDL base:  0x7f047000 | TDL up32: 0x00000000
    8. [  330.731114] <3>.(3)[2450:kworker/3:1H]mmc0: cqhci: Doorbell:  0x00001000 | TCN:      0x00000000
    9. [  330.732282] <3>.(3)[2450:kworker/3:1H]mmc0: cqhci: Dev queue: 0x00000000 | Dev Pend: 0x00001000
    10. [  330.733450] <3>.(3)[2450:kworker/3:1H]mmc0: cqhci: Task clr:  0x00000000 | SSC1:     0x00001000
    11. [  330.734619] <3>.(3)[2450:kworker/3:1H]mmc0: cqhci: SSC2:      0x00000001 | DCMD rsp: 0x00000000
    12. [  330.735785] <3>.(3)[2450:kworker/3:1H]mmc0: cqhci: RED mask:  0xfdf9a080 | TERRI:    0x00000000
    13. [  330.737229] <3>.(3)[2450:kworker/3:1H]mmc0: cqhci: Resp idx:  0x0000000d | Resp arg: 0x00000000
    14. [  330.738408] <3>.(3)[2450:kworker/3:1H]mmc0: cqhci: : ===========================================
    15. [  330.739688] <3>.(3)[4193:kworker/3:5]mmc0: running CQE recovery

    严重影响了开机速度和时间，查看emmc启动后模式：

    1. root@auto2735evb-ivt-main:~# cat /sys/kernel/debug/mmc0/ios
    2. clock:		200000000 Hz
    3. actual clock:	191999939 Hz
    4. vdd:		18 (3.0 ~ 3.1 V)
    5. bus mode:	2 (push-pull)
    6. chip select:	0 (don't care)
    7. power mode:	2 (on)
    8. bus width:	3 (8 bits)
    9. timing spec:	10 (mmc HS400)
    10. signal voltage:	1 (1.80 V)
    11. driver type:	0 (driver type B)

    问题分析

    检查电路图设计，检查硬件元器件焊接都没有问题，分析EMMC数据手册，5.1版本的EMMC需要接Data Strobe pin引脚来支持HS400模式，而4.5的版本是不需要接这个引脚所以最高只支持到HS200模式；Vcc是器件的电源接3.3V，Vccq是控制部分，决定数据和其他管脚的电平，接1.8V或者3.3V这样就与CPU芯片的管脚进行电平匹配。

     电路设计中，由于沿用之前的4.5版本硬件设计导致没有接Data Strobe pin引脚，所以HS400虽然探测成功，但读取数据失败；这样因为EMMC和CPU驱动都支持5.1版本。

     Data Strobe pin引脚是H5管脚，需要在下一版硬件接上后进行验证。

     问题解决

    只能强制探测到HS200模式，注释探测HS400模式代码：

    1. static int mmc_init_card(struct mmc_host *host, u32 ocr,
    2.     struct mmc_card *oldcard)
    3. {
    4.     struct mmc_card *card;
    5.     int err;
    6.     u32 cid[4];
    7.     u32 rocr;
    8.  
    9.     WARN_ON(!host->claimed);
    10.  
    11. 	......
    12.     if (mmc_card_hs200(card)) {
    13.         err = mmc_hs200_tuning(card);
    14.         if (err)
    15.             goto free_card;
    16.  
    17. //      err = mmc_select_hs400(card);
    18. //      if (err)
    19. //          goto free_card;
    20.     } else if (!mmc_card_hs400es(card)) {
    21.         /* Select the desired bus width optionally */
    22.         err = mmc_select_bus_width(card);
    23.         if (err > 0 && mmc_card_hs(card)) {
    24.             err = mmc_select_hs_ddr(card);
    25.             if (err)
    26.                 goto free_card;
    27.         }
    28.     }
    1. [    4.067441] <3>.(3)[68:kworker/3:1]mtk-msdc 11230000.mmc: host->mclk:400000, ios->clock:400000, host->timing:0,ios->timing:9
    2. [    4.068901] <3>.(3)[68:kworker/3:1]mtk-msdc 11230000.mmc: sclk: 399999, timing: 9, hz: 400000
    3. [    4.070330] <3>.(3)[68:kworker/3:1]mtk-msdc 11230000.mmc: host->mclk:400000, ios->clock:200000000, host->timing:9,ios->timing:9
    4. [    4.071903] <3>.(3)[68:kworker/3:1]mtk-msdc 11230000.mmc: sclk: 191999939, timing: 9, hz: 200000000
    5. [    4.130445] <3>.(3)[68:kworker/3:1]mmc0: Command Queue Engine enabled
    6. [    4.131595] <3>.(3)[68:kworker/3:1]mmc0: new HS200 MMC card at address 0001
    7. [    4.145960] <3>.(3)[68:kworker/3:1]mmcblk0: mmc0:0001 H8G4a2 7.28 GiB 
    8. [    4.148318] <3>.(3)[68:kworker/3:1]mmcblk0boot0: mmc0:0001 H8G4a2 partition 1 4.00 MiB
    9. [    4.150826] <3>.(3)[68:kworker/3:1]mmcblk0boot1: mmc0:0001 H8G4a2 partition 2 4.00 MiB
    10. [    4.152472] <3>.(3)[68:kworker/3:1]mmcblk0rpmb: mmc0:0001 H8G4a2 partition 3 4.00 MiB, chardev (234:0)
    11. [    4.160306] <3>.(3)[68:kworker/3:1] mmcblk0: p1
    12. [    4.168629] <3>.(3)[68:kworker/3:1]BOOTPROF:      4168.624624:probe: probe=mmc_bus_probe drv=mmcblk(mmc_driver)    34.474692ms
    1. root@auto2735evb-ivt-main:~#  cat /sys/kernel/debug/mmc0/ios
    2. clock:		200000000 Hz
    3. actual clock:	191999939 Hz
    4. vdd:		18 (3.0 ~ 3.1 V)
    5. bus mode:	2 (push-pull)
    6. chip select:	0 (don't care)
    7. power mode:	2 (on)
    8. bus width:	3 (8 bits)
    9. timing spec:	9 (mmc HS200)
    10. signal voltage:	1 (1.80 V)
    11. driver type:	0 (driver type B)
    1. root@auto2735evb-ivt-main:~# ls /dev/mmcblk0* -l
    2. brw-rw---- 1 root disk 179,  0 Apr  2 03:55 /dev/mmcblk0
    3. brw-rw---- 1 root disk 179,  8 Apr  2 03:55 /dev/mmcblk0boot0
    4. brw-rw---- 1 root disk 179, 16 Apr  2 03:55 /dev/mmcblk0boot1
    5. brw-rw---- 1 root disk 179,  1 Apr  2 03:55 /dev/mmcblk0p1
    6. crw------- 1 root root 234,  0 Apr  2 03:55 /dev/mmcblk0rpmb
    1. Disk /dev/mmcblk0: 7.3 GiB, 7818182656 bytes, 15269888 sectors
    2. Units: sectors of 1 * 512 = 512 bytes
    3. Sector size (logical/physical): 512 bytes / 512 bytes
    4. I/O size (minimum/optimal): 512 bytes / 512 bytes
    5. Disklabel type: dos
    6. Disk identifier: 0xd9379130
    7.  
    8. Device         Boot Start      End  Sectors  Size Id Type
    9. /dev/mmcblk0p1       2048 15269887 15267840  7.3G 83 Linux

    启动后使用fdisk工具进行分区和读写数据都正常了。

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  • 原文地址：https://blog.csdn.net/TSZ0000/article/details/125619571