On Friday 19 June 2009 17:32:18 Jon Ringle wrote:
> I loaded openwrt svn 16516 on my TEW-652BRP and noticed that I was getting
> random MAC addresses assigned:
> ar71xx: using random MAC address for eth0
> ar71xx: using random MAC address for eth1
>
> My investigation of this lead me to examine the following files:
>
> target/linux/ar71xx/files/arch/mips/ar71xx/devices.c
> target/linux/ar71xx/files/arch/mips/ar71xx/prom.c
> target/linux/generic-2.6/files/arch/mips/fw/myloader/myloader.c
> target/linux/generic-2.6/files/include/linux/myloader.h
>
> dmesg reports the following message from prom.c and myloader.c:
> prom: fw_arg0=00000002, fw_arg1=8006040c, fw_arg2=00000000,
> fw_arg3=00000000
> MyLoader: sysp=ccc4fdcd, boardp=efbccce7, parts=cdedfcee
>
> From the above, I can determine that myloader_get_info() will return null,
> because the magic values read above don't match those in myloader.h:
>
> ---- snip from myloader.h ----
> /* Myloader specific magic numbers */
> #define MYLO_MAGIC_SYS_PARAMS 0x20021107
> #define MYLO_MAGIC_PARTITIONS 0x20021103
> #define MYLO_MAGIC_BOARD_PARAMS 0x20021103
> ---- end snip from myloader.h ----
> ---- snip from myloader.c ----
> struct myloader_info * __init myloader_get_info(void)
> {
> struct mylo_system_params *sysp;
> struct mylo_board_params *boardp;
> struct mylo_partition_table *parts;
>
> if (myloader_found)
> return &myloader_info;
>
> sysp = (struct mylo_system_params *)(SYS_PARAMS_ADDR);
> boardp = (struct mylo_board_params *)(BOARD_PARAMS_ADDR);
> parts = (struct mylo_partition_table *)(PART_TABLE_ADDR);
>
> printk(KERN_DEBUG "MyLoader: sysp=%08x, boardp=%08x, parts=%08x\n",
> sysp->magic, boardp->magic, parts->magic);
>
> /* Check for some magic numbers */
> if (sysp->magic != MYLO_MAGIC_SYS_PARAMS ||
> boardp->magic != MYLO_MAGIC_BOARD_PARAMS ||
> le32_to_cpu(parts->magic) != MYLO_MAGIC_PARTITIONS)
> return NULL;
> ---- end snip from myloader.c ----
I opened https://dev.openwrt.org/ticket/5403 for this issue with some
additional info.
Jon
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