Hello,
I use uClinuc-dist-20051014 with linux-2.4.32 on a lpc2492 (this is an
arm7tdmi from NXP). Most of the time, everything works as expected.
But sometimes, the boot hangs when init/main.c tries to open
/dev/console
(this is a serial console on the internal UART of the lpc2492). When I
enter a character on the console, the boot continues. It looks like
some
sort of race condition, since it is not exactly reproducable.
I have tried to debug. Here is what I have found out so far.
init/main.c calls fs/devices.c:chrdev_open()
chrdev_open() calls drivers/char/tty_io.c:tty_open()
tty_open() calls drivers/char/serial.c/rs_open()
rs_open() calls drivers/char/serial.c/startup()
in startup(), right after the change_speed() call and before before the
"errout:"
label at the end of the function, the invocation of the
restore_flags(flags) macro hangs.
The restore_flags() macro appears to be the __restore_flags() from
include/asm-armnommu/proc_armv/system.h which appears to look like this:
/*
* restore saved IRQ & FIQ state
*/
#define __restore_flags(x) \
__asm__ __volatile__( \
"msr cpsr_c, %0 @ restore_flags\n" \
: \
: "r" (x) \
: "memory");
I am really stuck now.
Any ideas why this restore_flags() macro hangs sometimes and how it
comes to
continue when a character is input on the console?
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