[U-Boot-Users] PQ2FADS-ZU PQ28280 access to 60x bus SDRAM failed when localbus is in PCI mode?

Yuli Barcohen yuli at arabellasw.com
Wed Jun 15 17:18:46 CEST 2005

>>>>> KokHow Teh writes:

    Teh> I am having trouble with my PQ2FADS-ZU board with a PQ2 8280
    Teh> processor that when the localbus is put into PCI mode with LBPC
    Teh> = 01, all accesses to 60x bus SDRAM fails. Uboot failed in
    Teh> get_ram_size() routine.  The selection of localbus operation
    Teh> mode is done by SW9. Switch the jumper back to localbus SDRAM
    Teh> mode, U-boot boots to the prompt and access to 60x SDRAM is
    Teh> fine. Does anybody have similar experience? Any insight is
    Teh> appreciated.

Such a configuration works OK for me. There are some things to
check. You don't write what HRCW you use: from BCSR or from flash. If
the latter, you have to change pin assignment bits and MODCKH
accordingly. Also, clocks are calculated differently in PCI and local
bus modes. Check the MODCK/MODCKH values (SW6). Valid local bus mode
values can be invalid in PCI mode.

 Yuli Barcohen       | Phone +972-9-765-1788 |  Software Project Leader
 yuli at arabellasw.com | Fax   +972-9-765-7494 | Arabella Software, Israel

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