low-boot configuration to MPC8260ADS family boards (Again)

[VanBaren, Gerald (AGRE)]

> -----Original Message-----
> From: alebas at televes.com [mailto:alebas at televes.com]
> Sent: Wednesday, November 17, 2004 10:13 AM
> To: linuxppc-embedded at ozlabs.org; Ge at televes.com
> Cc: VanBaren, Gerald (AGRE)
> Subject: low-boot configuration to MPC8260ADS family boards (Again)
>
> Hi,
>
> My board is back, at last. Indeed, a new one has arrived. :-)
> OK, finally I think HRCW for MPC8272ADS board for flash
> lowboot should be 0x0E_74_B2_4A. But this is still not
> working. The board keeps reseting all the time.
>
> With the jumper JP9 set to config from flash, i have checked
> the contents of flash when halted ...
>
>
> 8272>md 0
> 00000000 : 00000e0e 00000e0e 00007474 00007474 
> ..........tt..tt 00000010 : 0000b2b2 0000b2b2 00004a4a
> 00004a4a  ..........JJ..JJ 00000020 : 00000000 00000000
> 00000000 00000000  ................
> 00000030 : 00000000 00000000 00000000 00000000  ................
> 00000040 : 00000000 00000000 00000000 00000000  ................
> 00000050 : 00000000 00000000 00000000 00000000  ................
> 00000060 : 00000000 00000000 00000000 00000000  ................
>
> So, this isn't what is supposed to be. Here HRCW will be load
> as 0x00000000 and the uboot code will also be corrupted with
> the same problem.
>
> However, when I check flash contents with the jumper JP9
> pointing to the BCSR, flash begining is...
>
> 8272>md 0xff800000
> ff800000 : 0e0e0e0e 0e0e0e0e 74747474 74747474 
> ........tttttttt ff800010 : b2b2b2b2 b2b2b2b2 4a4a4a4a
> 4a4a4a4a  ........JJJJJJJJ ff800020 : 00000000 00000000
> 00000000 00000000  ................
> ff800030 : 00000000 00000000 00000000 00000000  ................
> ff800040 : 00000000 00000000 00000000 00000000  ................
> ff800050 : 00000000 00000000 00000000 00000000  ................
>
>
> which is OK (and the same flash area than before).
>
> So, why can I view only 16 bits from each 32 bits in flash? Any idea?
> Must I change any other jumper?
>
> Thanks,
>
> Alex

It looks like you have your HRCW/flash/BR0 (any or all of the
preceeding) memory width misconfigured.  That is why you are seeing
0000xyxy -- you should see xyxyxyxy (four repeated bytes).  The PQ2FADS
flash is 32 bits wide, is the MPC8272ADS?  Your second HRCW byte "74" is
selecting 8 bits port size (BPS field) -- it looks like you are
configured for booting from EEPROM (8 bits wide), not flash.  I suspect
it should be "B4" which is what I'm using on the PQ2FADS.

The PQ2FADS can select either flash (8MByte, 32 bits wide) or EEPROM
(32K, 8 bits wide).  Obviously, you want to select flash, not EEPROM.
U-boot is not going to fit in EEPROM (per its design :-).  Is that the
"other jumper" you refer to?

gvb

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