Dear John,
in message <000101c3c3b8$68333110$b702a8c0 at newrock2> you wrote:
>
> I have a linux running on my mpc8260 board( power on reset at
> 0xfff00100, I use 32 bit flash, and directly maping 0xF0000000 ~
> 0xFFFFFFF in kernel).
>
> Now, I want to reboot system by software. But, when I jump to
> 0xfff00100 in kernel mode, it's going dead. Can anybody help me?
Jumping to some address does not cause a reboot of the system. After
a reset, the CPU state (especially the state of the memory
controller) is somewhat special. The safest way to cause a clean
reboot of the whole system is to actually go through a reset.
Try something like this:
void
m8260_restart(char *cmd)
{
__volatile__ unsigned char dummy;
__volatile__ unsigned int msr;
uint bad_addr;
/* Get base address mapped by BR0/OR0 */
bad_addr = ((immap_t *)IMAP_ADDR)->im_memctl.memc_br0 & 0xFFFF8000;
cli();
/* Enable CheckStop Reset */
((immap_t *)IMAP_ADDR)->im_clkrst.car_rmr |= 0x00000001;
/* Invalidate BR0 mapping */
((immap_t *)IMAP_ADDR)->im_memctl.memc_br0 = 0;
/* Set MSR and cause reset */
__asm__("mfmsr %0" : "=r" (msr) );
msr &= ~0x1000;
__asm__("mtmsr %0" : "=r" (msr) );
dummy = * (unsigned char *) bad_addr;
printk("Restart failed\n");
while(1);
}
Best regards,
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de
Bankers do it with interest (penalty for early withdrawal).
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