#17839: Reboot command causes sometimes hanging router with TL-WDR3600 (HW V1.5)
and TL-WDR4300 (HW V1.7)
--------------------------+-----------------------------------
Reporter: michaeluray | Owner: developers
Type: defect | Status: new
Priority: high | Milestone: Barrier Breaker 14.07
Component: base system | Version: Barrier Breaker 14.07
Resolution: | Keywords: reboot
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Comment (by michaeluray):
Replying to [comment:51 anonymous]:
> I think this change could not be the final solution because this code
will be used by all Atheros devices and I have no experience in kernel
programming.
>
> But may be this could leads to the right direction.
Thanks for the information, I think this will help.
So far as I have seen the reset register gets written correctly in the
OpenWRT program code. Your solution as well as the OpenWRT solution sets
the bit 24 which is the "FULL_CHIP_RESET" bit.
FULL_CHIP_RESET:
''"Used to command a full chip reset. This is the software
equivalent of pulling the reset pin. The system will reboot with
PLL disabled. Always zero when read."''
Maybe the register gets overwritten in a interrupt routine which raises
under some circumstances and this causes that the reboot problem occurs
not all the time.
If my assumption is right, then is probably somewhere a interrupt routine
which does not write on the right way to this register, or maybe is there
is a failure in the chip which resets this bit under some circumstances.
I have also no experience with kernel programming neither with more
hardware near programming, but I will try to compile and test BB with the
following changed function to fix this problem:
{{{
static void ath79_restart(char *command)
{
for (;;)
{
ath79_device_reset_set(AR71XX_RESET_FULL_CHIP);
if (cpu_wait)
cpu_wait();
}
}
}}}
I will probably find tomorrow some time to verify if this solution works
on the involved routers.
--
Ticket URL: <https://dev.openwrt.org/ticket/17839#comment:52>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
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