U-Boot issues

Hi all,

I am working on nios2mmu currently.

u-boot always reports "*** ERROR: unimplemented instruction..."

after the message "Uncompressing Kernel Image ... OK"

I found the problem is in bootm.c.

argc is only 2 while boot command is "bootm <boot-address>"

and I need to comment out two lines in bootm.c to make boot sequence works.

Do anyone meet the same issue and any suggestion ?.

arch/nios2/lib/bootm.c

int do_bootm_linux(int flag, int argc, char * const argv, bootm_headers_t *images)
{
        void (*kernel)(int, int, int, char *) = (void *)images->ep;
        char *commandline = getenv("bootargs");
        ulong initrd_start = images->rd_start;
        ulong initrd_end = images->rd_end;
        char *of_flat_tree = NULL;# if defined(CONFIG_OF_LIBFDT)
        ulong of_size = 0;
        /* find flattened device tree */
        if (boot_get_fdt(flag, argc, argv, images, &of_flat_tree, &of_size))
                return 1;# endif
//      if (!of_flat_tree)
//              of_flat_tree = (char *)simple_strtoul(argv, NULL, 16);
        if (of_flat_tree)
                initrd_end = (ulong)of_flat_tree;
        if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
                return 1;
        /* flushes data and instruction caches before calling the kernel */
        disable_interrupts();
        flush_dcache((ulong)kernel, CONFIG_SYS_DCACHE_SIZE);
        flush_icache((ulong)kernel, CONFIG_SYS_ICACHE_SIZE);
        debug("bootargs=%s @ 0x%lx\n", commandline, (ulong)&commandline);
        debug("initrd=0x%lx-0x%lx\n", (ulong)initrd_start, (ulong)initrd_end);
        /* kernel parameters passing

second issue I met is reset command. it never work.

my flash base address is 0x0

CONFIG_SYS_RESET_ADDR is 0xc0000000

from nios wiki, it should work, but it never happen to me. :(