Hi!
I solved our problem a different way: I added a reset of the CPM just
before calling te m8260_gorom().
The effect is that the message "rebooting" which was often followed by a
strange character is now cut short ("reboo"), but uboot is always
comming up afterwards. I've tested this by adding a "reboot" command in
an S script in rc3.d. The system with the unpatched kernel failed
aboutonce every 30 times it rebooted, with the patch it continued
rebooting correctly for 3 days (then I stopped the tests by hand).
The code for rebooting the CPM was obtained from the freescale manuals
of the mpc8270.
Anyone interested in the actual patch?
Theo.
Matvejchikov Ilya schreef:
> Hi!
>
> I thik that m8260_restart in 2.4 kernel is broken. Try to get it from
> the 2.6 kernel, or look at this.
>
> /* The 8260 has an internal 1-second timer update register that
> @@ -112,21 +123,16 @@ m8260_get_rtc_time(void)
> static void
> m8260_restart(char *cmd)
> {
> - extern void m8260_gorom(bd_t *bi, uint addr);
> - uint startaddr;
> -
> - /* Most boot roms have a warmstart as the second instruction
> - * of the reset vector. If that doesn't work for you, change this
> - * or the reboot program to send a proper address.
> - */
> - startaddr = 0xff000104;
> -
> - if (cmd != NULL) {
> - if (!strncmp(cmd, "startaddr=", 10))
> - startaddr = simple_strtoul(&cmd[10], NULL, 0);
> - }
> -
> - m8260_gorom((unsigned int)__pa(__res), startaddr);
> + __volatile__ unsigned char dummy;
> +
> + local_irq_disable();
> + ((cpm2_map_t *) cpm2_immr)->im_clkrst.car_rmr |= 0x00000001;
> +
> + /* Clear the ME,EE,IR & DR bits in MSR to cause checkstop */
> + mtmsr(mfmsr() & ~(MSR_ME | MSR_EE | MSR_IR | MSR_DR));
> + dummy = ((cpm2_map_t *) cpm2_immr)->im_clkrst.res[0];
> + printk("Restart failed\n");
> + while (1) ;
> }
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>
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