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

[KokHow Teh]

Hi;
      I have got the PCI interface of the board to run at 66.7 MHz by
setting PCIMODCK to "1" at SW6.

Regards,
TEH



"KokHow Teh" <KokHow.Teh at marconi.com>@lists.sourceforge.net on 06/16/2005
11:43:25 AM

Sent by:    u-boot-users-admin at lists.sourceforge.net


To:    "Yuli Barcohen <yuli" <yuli at arabellasw.com>,
       u-boot-users at lists.sourceforge.net
cc:

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



Hi;
      I have managed to boot up the board into PCI mode after looking at
the various  clock configuration modes laid down in MPC8280EC document.
However, I have tried with some values but I can't get PCI to run at 66.7
MHz. In addition, the PCIDF read from SCCR does not seem to match the
values laid down in the document with the MODCK values configured at SW6.
      Please advise if anyone has managed to get the PCI interface of
PQ2FADS-ZU to run at 66.7 MHz. Thanks.

/* CONFIG_PCI : 1010_010 - 1010_100 */
U-Boot 1.1.2 (Jun 16 2005 - 11:09:10)

MPC8260 Reset Status: External Soft, External Hard

MPC8260 Clock Configuration
 - Bus-to-Core Mult 4x, VCO Div -1, 60x Bus Freq  25-75 , Core Freq 100-300
 - dfbrg 1, corecnf 0x0a, busdf 3, cpmdf 1, plldf 0, pllmf 3, pcidf 5
 - vco_out  400000000, scc_clk  100000000, brg_clk   25000000
 - cpu_clk  400000000, cpm_clk  200000000, bus_clk  100000000
 - pci_clk   33333333

CPU:   MPC8260 (HiP7 Rev 13, Mask 0.1 1K49M) at 400 MHz
Board: Motorola PQ2FADS-ZU
DRAM:  32 MB
FLASH:  8 MB
*** Warning - bad CRC, using default environment

In:    serial
Out:   serial
Err:   serial
Net:   FCC2 ETHERNET
Hit any key to stop autoboot:  0
u-boot>

/* CONFIG_PCI : 1101_000 - 1101_100 */
U-Boot 1.1.2 (Jun 16 2005 - 11:09:10)

MPC8260 Reset Status: External Soft, External Hard

MPC8260 Clock Configuration
 - Bus-to-Core Mult 3x, VCO Div -1, 60x Bus Freq  16-50 , Core Freq  50-150
 - dfbrg 1, corecnf 0x10, busdf 4, cpmdf 1, plldf 0, pllmf 4, pcidf 9
 - vco_out  500000000, scc_clk  125000000, brg_clk   31250000
 - cpu_clk  300000000, cpm_clk  250000000, bus_clk  100000000
 - pci_clk   25000000

CPU:   MPC8260 (HiP7 Rev 13, Mask 0.1 1K49M) at 300 MHz
Board: Motorola PQ2FADS-ZU
DRAM:  32 MB
FLASH:  8 MB
*** Warning - bad CRC, using default environment

In:    serial
Out:   serial
Err:   serial
Net:   FCC2 ETHERNET
Hit any key to stop autoboot:  0
u-boot>



Regards,
TEH



Yuli Barcohen <yuli at arabellasw.com> on 06/15/2005 11:18:46 PM

To:    "KokHow Teh" <KokHow.Teh at marconi.com>
cc:    u-boot-users at lists.sourceforge.net

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


>>>>> 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
========================================================================








-------------------------------------------------------
SF.Net email is sponsored by: Discover Easy Linux Migration Strategies
from IBM. Find simple to follow Roadmaps, straightforward articles,
informative Webcasts and more! Get everything you need to get up to
speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click
_______________________________________________
U-Boot-Users mailing list
U-Boot-Users at lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/u-boot-users