Question

我们有基于BBB的定制板，
我们在板上有SPI NOR闪存和NAND闪存，
我们能够为NAND制作mtd分区。但NOR分区不起作用:(
我们添加了以下定义来创建mtd NOR分区。

#define MTDIDS_DEFAULT "nand0=omap2-nand.0, nor0=omap2-nor.0"
#define MTDPARTS_DEFAULT "mtdparts=omap2-nand.0:" \
"128k(SPL)," \
"128k(SPL.backup1)," \
"128k(SPL.backup2)," \
"128k(SPL.backup3)," \
"1024k(u-boot)," \
"1024k(u-boot.backup1)," \
"128k(u-boot-env)," \
"5m(kernel)," \
"5m(kernel.backup1)," \
"512k(fdt)," \
"512k(fdt.backup1)," \
"100m(rootfs)," \
"100m(rootfs.backup1)," \
"13m(reserved)," \
";" \
"mtdparts=omap2-nor.0:" \
"128k(SPL1_nor)," \
"128k(SPL2_nor)," \
"128k(SPL3_nor)," \
"128k(SPL4_nor)," \
"512k(usr_nor)," \

另一个疑问是，是否可以在u-boot中使用mtd设备文件进行读/写？据我了解，u-boot也使用Linux的mtd驱动程序，所以
是否可以从u-boot代码执行类似fd = open（＆＃34; / dev / mtd0＆＃34;，O_WRONLY）的操作？

Answer 1

为了允许对SPI NOR进行分区，我在spi_flash_probe（）的末尾添加了以下内容：

/* Release spi bus */
spi_release_bus(spi);

extern nand_info_t nand_info[];
struct mtd_info *mtd;

mtd = &nand_info[1];
mtd->name = "nor0";
mtd->size = flash->size;
mtd->erasesize = flash->erase_size;
mtd->writesize = flash->page_size;
mtd->priv = flash;
mtd->_write = sf_mtdwrite;
mtd->_read = sf_mtdread;
mtd->_erase = sf_mtderase;
#ifdef CONFIG_MTD_DEVICE
add_mtd_device(mtd);
#endif

return flash;

然而，没有例如“读/写/擦除分区”的概念，这些概念分别存在于NAND和SPIFLASH中。因此，在SPI NOR上定义分区并不是很有用，除非要创建通用的mtd命令（mtd write，mtd read，mtd erase ...）。

SPI NOR从u-boot C代码进行分区和读/写

1 个答案: