linux-kernel - Fwd: [PATCH] Reboot Dreamcast under software control

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Date:	Sun, 29 Jul 2007 19:25:21 +0100
From:	"Adrian McMenamin" <lkmladrian@...il.com>
To:	linux-kernel@...r.kernel.org, linuxsh-dev@...ts.sourceforge.net
Subject: Fwd: [PATCH] Reboot Dreamcast under software control

Apologies. I meant to cc: this to the lists first time round and
appear to have bcc'ed it instead.

---------- Forwarded message ----------
From: Adrian McMenamin <lkmladrian@...il.com>
Date: 29-Jul-2007 19:04
Subject: [PATCH] Reboot Dreamcast under software control
To: lethal@...ux-sh.org


In the light of more up to date technical information I have
discovered there is a register at physical address 0x005F6890 on the
Dreamcast that if written a magic number (0x00007611) will force a
reboot under software control.

Presumably a better option than the current catch-all mechanism.

Signed-off by: Adrian McMenamin <adrian@...en.demon.co.uk>

diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c
index 6334a4c..6f5e9e4 100644
--- a/arch/sh/kernel/process.c
+++ b/arch/sh/kernel/process.c
@@ -97,6 +97,11 @@ void cpu_idle(void)

 void machine_restart(char * __unused)
 {
+
+#ifdef CONFIG_SH_DREAMCAST
+       /*reboot the Dreamcast under software control*/
+       writel(0x00007611, 0xA05F6890);
+#endif
        /* SR.BL=1 and invoke address error to let CPU reset (manual reset) */
        asm volatile("ldc %0, sr\n\t"
                     "mov.l @%1, %0" : : "r" (0x10000000), "r" (0x80000001));
-
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