Unable to Read PPC440EPx Board ID thru Board Control and Status Registers (BCSR)

[Dell Query]

Hi Stefan,

1. I used the 0x1c0002000 offset because I was referring to the first reply that I received. Now, I used the address 0x1c0002000 and tried to read from it. I retrieved 0x0f01c087. May I know what does this mean? How does this data relate to Board ID?

2. Referring back to "Embedded Planet 440xC" document, I tried to activate the USER_LED0/USER_LED1 (with new address 0x1c0000000 + 0x2 offset) by setting it to 0. But didn't see the led turned on. Did some experiments and tried 0x1c0000000 without offset, sent 0, and found that USER_LED0 (CR3) and USER_LED1 (CR4) are activated! This got me confused. May I know why is this so? Could you please refer me to some documents?


Thanks for all the assistance.

Regards,
dell
Stefan Roese <sr at denx.de> wrote: On Thursday 29 November 2007, Dell Query wrote:
> I see. No wonder I couldn't get more information on BCSR. I should contact
> sequoia to get the proper details like the correct addresses.
>
> I already used ioremap64(), remapping 0x1c0002000. I got a hex value for
> the Board ID but could figure out what it means. So I tried the
> USER_LED0/USER_LED1 (base address+0x2), to see if I could turn on/off the
> user LEDS, but still no luck. I think I am accessing the wrong addresses so
> I need to verify it with them.

Why do think you need the offset 0x2000? I just tested on my Sequoia under 
U-Boot and "see" the CPLD at address 0xc000.0000:

=> md.b c0000000 20
c0000000: 0f 00 c0 07 00 80 00 80 00 20 00 00 00 00 00 00    ......... ......
c0000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

So you should map not 0x1.c000.2000 but 0x1.c000.0000 under Linux. Please let 
me know if this works.

Best regards,
Stefan

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