linux内核 mtd分区
2024-09-01 17:23:29
首先
内核配置需要打开MTD选项
Memory Technology Devices (MTD) --->
如果是NOR Flash，需要选择Common Flash Interface (CFI)相关的选项；而且需要配置映射首地址（和uboot中配置的flash首地址一致）、映射地址大小和位宽
<*> CFI Flash device in physical memory map
(0xff800000) Physical start address of flash mapping
(0x2000000) Physical length of flash mapping
(2) Bank width in octets
如果是NAND Flash，需要选择NAND Flash相关的选项
修改内核文件
linux-2.6.15.b/drivers/mtd/maps/physmap.c
//linux
#define FLASH_PARTITION1_ADDR 0x00000000 //偏移地址
#define FLASH_PARTITION1_SIZE 0x001C0000 //大小
//ramdisk
#define FLASH_PARTITION2_ADDR 0x001C0000
#define FLASH_PARTITION2_SIZE 0x00240000
//ramdisk reserve
#define FLASH_PARTITION3_ADDR 0x00400000
#define FLASH_PARTITION3_SIZE 0x00380000
//uboot Environment
#define FLASH_PARTITION4_ADDR 0x00780000
#define FLASH_PARTITION4_SIZE 0x00020000
//uboot
#define FLASH_PARTITION0_ADDR 0x007A0000
#define FLASH_PARTITION0_SIZE 0x00060000
static struct mtd_partition mtd_parts[] = {
{
.name = "Bootloader",
.offset = FLASH_PARTITION0_ADDR,
.size = FLASH_PARTITION0_SIZE
},
{
.name = "Kernel image",
.offset = FLASH_PARTITION1_ADDR,
.size = FLASH_PARTITION1_SIZE
},
{
.name = "Initial ramdisk image",
.offset = FLASH_PARTITION2_ADDR,
.size = FLASH_PARTITION2_SIZE
},
{
.name = "ramdisk reserve",
.offset = FLASH_PARTITION3_ADDR,
.size = FLASH_PARTITION3_SIZE
},
{
.name = "uboot Environment",
.offset = FLASH_PARTITION4_ADDR,
.size = FLASH_PARTITION4_SIZE
},
};
#define PARTITION_COUNT (sizeof(mtd_parts)/sizeof(struct mtd_partition))
可参考地址：https://blog.csdn.net/wenlifu71022/article/details/4334962
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