Re: [ts-7000] 2.6.18 hangs on reboot (PATCH)

[Marco Pracucci <>]

Hi,

as you know, the Cirrus EP9301 watchdog reset has serious problem, so I
have patched the linux vanilla kernel 2.6.18 in order to fix the reset
problem (as technologic systems has already done for 2.4.x). The patch
is attached below.

Regards,
Marco Pracucci

> Hi all,
>
> I have just tested the TS-7200 with linux kernel 2.6.18 and derevo patch
> 20.1. I have experienced a problem that frequently occours: the system
> hangs on reboot. In particular, after I call the reboot command
> (sysvinit-2.86) the system prints
>
> Rebooting... Restarting system.
> .
>
> and then hangs.
>   


This patch fix a reset problem on Cirrus EP9301/EP9302 processor,
using the TS-72XX watchdog timer. This patch should be applyied against
vanilla kernel 2.6.18

Marco Pracucci
Francesco Baschieri


--- linux-2.6.18-vanilla/include/asm-arm/arch-ep93xx/system.h  
2006-09-20 03:42:06.000000000 +0000
+++ linux-2.6.18/include/asm-arm/arch-ep93xx/system.h   2006-10-10
15:33:16.000000000 +0000
@@ -4,6 +4,10 @@

 #include <asm/hardware.h>

+#define TS7XXX_WATCHDOG_CTRL 0x23800000
+#define TS7XXX_WATCHDOG_FEED 0x23C00000
+
+
 static inline void arch_idle(void)
 {
        cpu_do_idle();
@@ -11,16 +15,15 @@

 static inline void arch_reset(char mode)
 {
-       u32 devicecfg;
-
        local_irq_disable();
+
+       //
+       // Enable the watchdog timer so that it will reset the part.
+       //
+
+       // Use TS-7200 watchdog
+       __raw_writew(0x5, TS7XXX_WATCHDOG_FEED);
+       __raw_writew(0x1, TS7XXX_WATCHDOG_CTRL);

-       devicecfg = __raw_readl(EP93XX_SYSCON_DEVICE_CONFIG);
-       __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
-       __raw_writel(devicecfg | 0x80000000, EP93XX_SYSCON_DEVICE_CONFIG);
-       __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
-       __raw_writel(devicecfg & ~0x80000000, EP93XX_SYSCON_DEVICE_CONFIG);
-
-       while (1)
-               ;
+       while (1);
 }





 
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