FW: Embedded Planet 860T software reset

FW: Embedded Planet 860T software reset

[Mike Flynn]

Software resets works! Our Julia found John Whitney's comment:

	"I soft reboot my system using "shutdown -nr now..."

Dan's code works as provided. "init 6" and "reboot" don't work, but we have
something
that does.

Mike Flynn
Enerdyne

-----Original Message-----
From: Mike Flynn [mailto:mflynn@enerdyne.com]
Sent: Monday, September 18, 2000 10:17 AM
To: 'linuxppc-embedded@lists.linuxppc.org'
Subject: Embedded Planet 860T software reset



Has anyone been able to execute "reset" or "init 6" in linux 2.2.13 running
on Embedded Planet board and have the system actually reboot?

I found and tried the following code in the archives:

+++ linux/arch/ppc/kernel/m8xx_setup.c	Tue Jun 27 09:47:27 2000
@@ -228,9 +240,17 @@
 void
 m8xx_restart(char *cmd)
 {
-	extern void m8xx_gorom(void);
+	extern void m8xx_gorom(uint bp, uint startaddr);
+	uint	startaddr;
+
+	startaddr = 0xfff00100;
+
+	if (cmd != NULL) {
+		if (!strncmp(cmd, "startaddr=", 10))
+			startaddr = simple_strtoul(&cmd[10], NULL, 0);
+	}

-	m8xx_gorom();
+	m8xx_gorom((uint)__pa(res), startaddr);
 }

 void

Dan said, "At one time, I had modified
the kernel "gorom()" function to simply jump into the boot rom as
if a reset occurred.  I should make this work again for many reasons."

Does anyone know of any further developments and/or successes?

Thanks,

Mike Flynn
Principal Software Engineer
Enerdyne Technologies
8402 Magnolia Ave.
Suite C
Santee, CA 92041
Voice: 619-562-3061
MFlynn@Enerdyne.com


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Re: FW: Embedded Planet 860T software reset

[Dan Malek]

Mike Flynn wrote:
>
> Software resets works! Our Julia found John Whitney's comment:
>
>         "I soft reboot my system using "shutdown -nr now..."
>
> Dan's code works as provided. "init 6" and "reboot" don't work, but we have
> something
> that does.

The "init" and "reboot" (actually halt) follow a circuitous route
to the shutdown program.  They depend on a variety of files or
environment variables and work well in a fully configured workstation
environment.  They probably won't work correctly in a stripped down
file system of an embedded system.

Also, the code in the kernel may have to be adapted based upon the
boot rom used.  Jumping into rom is a questionable operation.  I am
adding the checkstop/reset patch that was posted a while back to the
2.4 tree (and probably backported to 2.2 as well) as a configuration
option.  This isn't a complete solution either, as it prevents passing
parameters around that are sometimes useful.

Options galore....choose what works for you....not a single solution
for everyone....


	-- Dan

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