NUC980 添加XT25BF256BWSIG spi-nor flash

nuc980板子更换了一个新的spi-nor flash，需要在boot和内核里注册，注册后启动挂载文件系统报错，这里简单记录一下处理方法

首先在boot上添加spi-nor的芯片id

修改文件：NUC970_U-Boot_v2016-spi/drivers/mtd/spi/sf_params.c
在spi_flash_params_table中增加一行，这里看到原来有XT系列的其他芯片，直接在其下面添加即可：

#ifdef CONFIG_SPI_FLASH_XTX		/* XTX */
	{"XT25F08BSSIGU",  0x0b4013, 	0x0,	64 * 1024,   16, RD_FULL | WR_QPP | SECT_4K},
	{"XT25F16BSSIGU",  0x0b4014, 	0x0,	64 * 1024,   32, RD_FULL | WR_QPP | SECT_4K},
	{"XT25F32BSSIGU",  0x0b4015, 	0x0,	64 * 1024,   64, RD_FULL | WR_QPP | SECT_4K},
	{"XT25F64BSSIGU",  0x0b4016, 	0x0,	64 * 1024,   128, RD_FULL | WR_QPP | SECT_4K},
	{"XT25F128BSSIGU",  0x0b4017, 	0x0,	64 * 1024,   256, RD_FULL | WR_QPP | SECT_4K},
	{"XT25F256BSSIGU",  0x0b4018, 	0x0,	64 * 1024,   512, RD_FULL | WR_QPP | SECT_4K},
	{"XT25BF256BWSIG",  0x0b4019,   0x0,	64 * 1024,   512, RD_FULL | WR_QPP | SECT_4K},  //新增加
#endif
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配置uboot支持XT的spi-nor

页面路径：Device Drivers > SPI Flash Support

内核添加添加spi-nor的芯片id

修改文件：drivers/mtd/spi-nor/spi-nor.c
找到spi_nor_ids[] =
里面也有XT系列的参数：

	/* XTX -- XT25x "blocks" are 64K, "sectors" are 4KiB */
	{ "XT25F08BSSIGU", INFO(0x0b4013, 0, 64 * 1024,  16, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
	{ "XT25F16BSSIGU", INFO(0x0b4014, 0, 64 * 1024,  32, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
	{ "XT25F32BSSIGU", INFO(0x0b4015, 0, 64 * 1024,  64, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
	{ "XT25F64BSSIGU", INFO(0x0b4016, 0, 64 * 1024,  128, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
	{ "XT25F128BSSIGU", INFO(0x0b4017, 0, 64 * 1024,  256, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
	{ "XT25F256BSSIGU", INFO(0x0b4018, 0, 64 * 1024,  512, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
	{ "XT25BF256BWSIG", INFO(0x0b4019, 0, 64 * 1024,  512,  SECT_4K) }, //新增加的

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这里需要注意下，如何最后的flag参数那里加上SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ的话，会导致文件系统挂载错误，错误如下：

jffs2 Magic bitmask 错误
jffs2: Node at 0x00000f6c with length 0x00000144 would run over the end of the erase block
[    1.133830] jffs2: Perhaps the file system was created with the wrong erase size?
[    1.141435] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000f70: 0x0144 instead
[    1.150994] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000f74: 0x912a instead
[    1.160547] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000f78: 0x0002 instead
[    1.170127] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000f7c: 0x000d instead
[    1.180689] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000f80: 0x81a4 instead
[    1.190183] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000f84: 0x03e8 instead
[    1.199668] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000f88: 0x11d8 instead
[    1.209151] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000f8c: 0xdec2 instead
[    1.218634] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000f90: 0xdec2 instead
[    1.228102] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000f94: 0xdec2 instead
[    1.237581] jffs2: Further such events for this erase block will not be printed
[    1.245110] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00001000: 0x3fb1 instead
[    1.254615] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00001004: 0x1a28 instead
[    1.264102] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00001008: 0x7f01 instead
[    1.273586] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000100c: 0x505d instead
[    1.283098] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00001010: 0x84c8 instead
[    1.292588] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00001014: 0xd8d1 instead
[    1.302072] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00001018: 0x4001 instead
[    1.311555] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000101c: 0x8485 instead
[    1.321033] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00001020: 0x65b1 instead
[    1.330514] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00001024: 0x5d81 instead
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文件系统打包命令

mkfs.jffs2 -s 0x1000 -e 0x10000 -p --pad=0x1A00000 -d rootfs/ -o rootfs-jffs2.img
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这里-s代表页大小，普通spi nor flash的页大小是256字节，即0x100，但是这里测试用0x1000（4K）也没问题；

-e表示擦除的块大小，普通spi nor flash的块大小是64K字节，即0x10000
-p表示分区大小，在生成时会擦除分区大小的flash初始化。
这里必须和uboot里指定的分区大小一致，否则会出现脏页。