Hi,
I've been trying to add NAND flash support to my u-boot but having issues. I'd really appreciate if anyone could give me any suggestions/comments on what I'm doing wrong.
The board I have is based on AMD au1550, and it has one NOR flash and one NAND flash. NAND flash is configured in lowlevel_init.S correctly (I believe so since it works from Linux kernel.) However, when I try to send any command to NAND flash, it just hangs there. Here are the command macros I have:
#define NAND_WAIT_READY(nand) while (!(*(volatile u8 *)((ulong)MEM_STSTAT) & 0x01)) #define WRITE_NAND_COMMAND(d, adr) do { printf("weee!"); *(volatile u8 *)((ulong)adr+MEM_STNAND_CMD) = d; __asm__ volatile ("sync"); } while(0) #define WRITE_NAND_ADDRESS(d, adr) do {*(volatile u8 *)((ulong)adr+MEM_STNAND_ADDR) = d; __asm__ volatile ("sync");} while(0) #define WRITE_NAND(d, adr) do {*(volatile u8 *)((ulong)adr+MEM_STNAND_DATA) = d; __asm__ volatile ("sync");} while(0) #define READ_NAND(adr) (*(volatile u8 *)((ulong)adr+MEM_STNAND_DATA)) #define NAND_DISABLE_CE(nand) do { *(volatile u8 *)(MEM_STNDCTL) = 0; __asm__ volatile ("sync");} while(0) #define NAND_ENABLE_CE(nand) do { *(volatile u8 *)(MEM_STNDCTL) = (1<<5); __asm__ volatile ("sync");} while(0)
These are empty since the processor handles them.
#define NAND_CTL_CLRALE #define NAND_CTL_SETALE #define NAND_CTL_CLRCLE #define NAND_CTL_SETCLE
Thank you for your help in advance!
Mitsy