[U-Boot] POST Problems on MPC8[5/6]xx

[U-Boot] POST Problems on MPC8[5/6]xx

[John Schmoller]

Hello all,

I'm seeing issues on our MPC8[5/6]xx products in relation to POST
testing.  I see that the POST word is stored in a spare, unused register
in the PIC, but this register seems to be cleared during
interrupt_init() when the PIC is reset.  This means that I am seeing the
POST_ROM tests run (pre interrupt_init()) but the word then gets blown
away and the POST_RAM tests do not run (post interrupt_init()).  I
browsed through the MPC8572 UM and didn't see any obvious replacements
for TFRR that wouldn't be reset.  Do others see this issue?  Freescale
guys, are you aware of some other register we can use?

Thanks,
John  

[U-Boot] POST Problems on MPC8[5/6]xx

[Kumar Gala]

On Jan 26, 2011, at 4:03 PM, John Schmoller wrote:

> Hello all,
> 
> I'm seeing issues on our MPC8[5/6]xx products in relation to POST
> testing.  I see that the POST word is stored in a spare, unused register
> in the PIC, but this register seems to be cleared during
> interrupt_init() when the PIC is reset.  This means that I am seeing the
> POST_ROM tests run (pre interrupt_init()) but the word then gets blown
> away and the POST_RAM tests do not run (post interrupt_init()).  I
> browsed through the MPC8572 UM and didn't see any obvious replacements
> for TFRR that wouldn't be reset.  Do others see this issue?  Freescale
> guys, are you aware of some other register we can use?
> 
> Thanks,
> John  

Not really, probably best to just have the PIC code save & restore the TFRR if #define CONFIG_POST

- k