[U-Boot] Board is not booting after flashing U-boot and hard reset

[prakash bedge]

Hi Stefan,

Why the below code start with the TLB1?

My U-boot image is supposed to boot from flash, so here #else condition is
valid in my case. I believe it should start from the TLB 0 entry. But I
think TLB0 is not selected.

code snippet from /cpu/ppc4xx/start.S

  addis    r0,0,0x0000
#ifdef CONFIG_SYS_RAMBOOT
    li    r4,0        /* Start with TLB #0 */
#else
    li    r4,1        /* Start with TLB #1 */
#endif
    li    r1,64        /* 64 TLB entries */
    sub    r1,r1,r4    /* calculate last TLB # */
    mtctr    r1

...
Here we are setting TLBs from 0-63.
#else
    bl    tlbtab        /* Get tlbtab pointer */
#endif
    mr    r5,r0
    li    r1,0x003f    /* 64 TLB entries max */
    mtctr    r1
    li    r4,0        /* TLB # */

I might be not very clear of above code. Please explain.


Thanks,
Prakash

On Tue, Dec 29, 2009 at 8:34 PM, prakash bedge <
embeddeddeveloper2009 at gmail.com> wrote:

> Hi All,
>
> I am facing an error while flashing u-boot on my PPC4xx based board.
>
> When I flash the u-boot on the PCI board I am developing, and hard reset
> the board, then the board is not able to boot up.
> Also I am not able to debug the code as probe connection fails.
>
> Whar are the reason that I should check to see why the board is not booting
> up after hard reset.
> Is it fault in start.S or somewhere else in code I need to see?
>
> It would be great if someone who already have a solution on this
> porblem, share his experience.
>
>
> Thanks & Regards,
> Prakash Bedge
>