[OpenWrt-Devel] [PATCH] Unable to get any OpenWrt version working on Asus WL-300g

[Ondrej Zary]

(I cannot post or register on OpenWrt Trac - captcha seems to be broken).

Found another bug: /sbin/init eats 100% CPU. Looks like an infinite loop:

root@(none):~# /tmp/strace -p 1
/tmp/strace: Process 1 attached
write(3, "X", 1)                        = 1
clock_gettime(CLOCK_MONOTONIC, {88, 255641161}) = 0
write(3, "X", 1)                        = 1
clock_gettime(CLOCK_MONOTONIC, {88, 266508613}) = 0
write(3, "X", 1)                        = 1
clock_gettime(CLOCK_MONOTONIC, {88, 277430055}) = 0
write(3, "X", 1)                        = 1
clock_gettime(CLOCK_MONOTONIC, {88, 287997090}) = 0
write(3, "X", 1)                        = 1
clock_gettime(CLOCK_MONOTONIC, {88, 299143549}) = 0
write(3, "X", 1)                        = 1
clock_gettime(CLOCK_MONOTONIC, {88, 310360183}) = 0
write(3, "X", 1)                        = 1
clock_gettime(CLOCK_MONOTONIC, {88, 323103356}) = 0
write(3, "X", 1)                        = 1
clock_gettime(CLOCK_MONOTONIC, {88, 334053084}) = 0
write(3, "X", 1)                        = 1
clock_gettime(CLOCK_MONOTONIC, {88, 344951850}) = 0
write(3, "X", 1)                        = 1
...repeats forever

The BCM4702 SoC used in WL-300g does not have an UART so there's no ttyS0 
device. The kernel parameters specify console=ttyS0,115200 so the console 
does not work:
dmesg sys: Warning: unable to open an initial console.
# cat /dev/console
cat: can't open '/dev/console': No such device

Seems that procd does something wrong in this special case.
I modified initd/early.c to use /dev/kmsg (remembering to create it in 
early_dev()) instead of /dev/console (& recompiled procd & put /sbin/init in 
the image). That helped: no more 100% CPU usage (although it's not a fix)

-- 
Ondrej Zary
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