Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

nios2linux-MMU errors

i used sdr sdram in my project .

sdram_base ： 0x02000000

sdram_end ： 0x02ffffff

when i downloaded my project to the board,had some errors：

...

Downloaded 3810KB in 66.3s (57.4KB/s)

Verifying C3000000 (0%)

Verify failed between address 0xc3000000 and 0xC300FFFF

...

i found that make menuconfig setting:

NiosII Configuration

(0x1C80000) Offset address for uImage.flash

(0x01000000) Link address offset for booting

and in the default_mmu.h file( sopc-create-header-files --single default_mmu.h)

#define KERNEL_REGION_BASE 0xc0000000# define IO_REGION_BASE 0xe0000000# define KERNEL_MMU_REGION_BASE 0x80000000# define USER_REGION_BASE 0x0# define PROCESS_ID_NUM_BITS 10# define TLB_NUM_WAYS 16# define TLB_NUM_WAYS_LOG2 4# define TLB_PTR_SZ 8# define TLB_NUM_ENTRIES 256# define FAST_TLB_MISS_EXCEPTION_ADDR 0xc0002000# define EXCEPTION_ADDR 0xc2000020# define RESET_ADDR 0xc0001000# define BREAK_ADDR 0xc1001020

why it started at c3000000 ?

the started address setting is too large?

how should i modify ?

thanks you help

arens

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    Your "Link address offset for booting" is too high. 0x02000000 + 0x01000000 = 0x03000000.

    That address is where the zImage gets loaded, then it gets decompressed to offset 0. So size of your RAM - a bit more than the size of your image should be good. i.e. 0x01000000 - 0x400000 (4MiB) = 0xC00000 should work as long as your image doesn't grow over 4MiB.