[U-Boot-Users] PQ2FADS-ZU PQ28280 access to 60x bus SDRAM failed when localbus is in PCI mode?
Hi; I am having trouble with my PQ2FADS-ZU board with a PQ2 8280 processor that when the localbus is put into PCI mode with LBPC = 01, all accesses to 60x bus SDRAM fails. Uboot failed in get_ram_size() routine. The selection of localbus operation mode is done by SW9. Switch the jumper back to localbus SDRAM mode, U-boot boots to the prompt and access to 60x SDRAM is fine. Does anybody have similar experience? Any insight is appreciated.
Regards, TEH
On Wed, 2005-06-15 at 17:42 +0800, KokHow Teh wrote:
Hi; I am having trouble with my PQ2FADS-ZU board with a PQ2 8280 processor that when the localbus is put into PCI mode with LBPC = 01, all accesses to 60x bus SDRAM fails. Uboot failed in get_ram_size() routine. The selection of localbus operation mode is done by SW9. Switch the jumper back to localbus SDRAM mode, U-boot boots to the prompt and access to 60x SDRAM is fine. Does anybody have similar experience? Any insight is appreciated.
Me me! I'm in the same boat, and have exactly the same issues!
I have an outstanding support request to Freescale, but if get an answer before I do, please post it here!
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.
On Wed, 2005-06-15 at 17:42 +0800, KokHow Teh wrote:
I am having trouble with my PQ2FADS-ZU board with a PQ2 8280processor that when the localbus is put into PCI mode with LBPC = 01, all accesses to 60x bus SDRAM fails. Uboot failed in get_ram_size() routine. The selection of localbus operation mode is done by SW9. Switch the jumper back to localbus SDRAM mode, U-boot boots to the prompt and access to 60x SDRAM is fine. Does anybody have similar experience? Any insight is appreciated.
For the Mailling List Archives:
If you're using the 'default' 100Mhz bus crystal on your PQ2FADS, and all other jumpers are factory defaults, the MODCKH[0-3]_MODCK[1-3] settings on SW6 are:
JP9 -> Local: 0101_111
JP9 -> PCI: 1010_010 (66Mhz PCI bus)
Where '1' is the "Off" switch position, and '0' is the 'On' position.
participants (3)
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Jason McMullan -
KokHow Teh -
Yuli Barcohen