SPI NOR分区和从u-boot C代码读取/写入
SPI NOR分区和从u-boot C代码读取/写入
提问于 2014-11-24 17:42:17
我们有基于BBB的定制板，
电路板上有SPI NOR闪存和NAND闪存
我们能够为NAND创建mtd分区。但分区也不起作用:(
我们添加了以下定义来创建mtd或分区。
#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？
据我所知，u-boot也使用Linux的mtd驱动程序，所以
是否可以从u-boot代码中执行fd = open("/dev/mtd0"，O_WRONLY)之类的操作？
回答 1
Stack Overflow用户
发布于 2015-06-02 21:04:56
为了允许对SPI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，这些概念对于NAND和SPIFLASH是分开存在的。因此，在SPI上定义分区也不是很有用，除非是通用的mtd命令(mtd写入、mtd读取、mtd擦除...)是要创建的。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/27101749
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