Ok,
I found that I have made a mistake: "reboot -h" is not the same as
"shutdown -h".
The problem with power management is twofold. One is that the reboot -
h (restart) does indeed not work. This is probably because that thread
finally executes
void jz_restart(char *command)
{
__wdt_set_count(0xffffffff-32); /* reset after 1/1024 s */
__wdt_start();
while (1);
}
Ok, this should trigger the watchdog timer (that is to what I expand
wdt). That even works if I press Fn-Ctrl-Shift so that it boots again
from SD card...
Now, the halt and power-off commands end up in
void jz_halt(void)
{
__wdt_set_count(0xffffffff-32); /* reset after 1/1024 s */
__wdt_start();
while (1);
}
Which is the same! So the wdt reboots the machine.
So we need to initialize the appropriate hooks in our board-minipc.c
file and write our own restart/halt/power_off handlers.
Does anyone have an idea (from a 2.4 kernel?) how we can command the
power management chip to turn off power for the CPU and LCM? Does this
go through a GPIO?
BR,
Nikolaus
Am 05.05.2010 um 11:16 schrieb Dr. H. Nikolaus Schaller:
Just a first observation:
I have added a printk to kernel/sys.c/sys_reboot() to print the cmd
parameter.
On reboot -h it appears to be 19000473 (difficult to read before the
screen washes out) - but I am not even sure if that value is constant.
Nikolaus
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