AW: [U-Boot-Users] LITE5200 board: Bus Fault with 2 network cards
Hi Olivier,
-----Ursprüngliche Nachricht----- Von: Olivier Singla [mailto:olivier@singla.us] Gesendet: Dienstag, 13. Juli 2004 04:12 An: u-boot-users@lists.sourceforge.net Betreff: [U-Boot-Users] LITE5200 board: Bus Fault with 2 network cards
I use a Lite5200 board (ref. board from Motorola). With the two PCI network cards I tried (which I would want to use under Linux 2.4.25), u-boot crashes:
Are these cards 3.3 V types? Have you inserted the cards in the right direction? Since the keys for 3.3 V and 5 V are symmetric, it is possible to insert a 5 V card upside down in a 3.3 V slot (at least if it is mechanically possible, like on the Lite5200 board).
Two others PCI cards, not network (Maxtor SATA and USB-2.0) did not bring any issue with u-boot 1.1.1
Is there a known issue with the PCI on the MPC5200, and more specifically with PCI network cards ?
I also have problems with some PCI cards. Some are recognized, some not. I haven't found an explanation, yet. I guess it has something to do with some "3.3 V compatible" cards are not really compatible with 3.3 V only systems. It could as well be an errata in the MPC5200 described in the MPC5200 Errata Listing:
ID 322: Violation of PCI Tval min time
The PCI Timing Speci?cation de?nes the timing parameter Tval (CLK to Signal Valid Delay): Tval min 2 ns, max 11 ns (33MHz) Tval min 2 ns, max 6 ns (66MHz) When M66EN is asserted, the minimum speci?cation for Tval(min) may be reduced to 1 ns if a mechanism is provided to guarantee a minimum value of 2 ns when M66EN is deasserted. MPC5200 provides Tval min of 1 ns (instead of 2 ns), which is a violation of the Timing Speci?cation for 33MHz.
Best Regards, Martin
Martin Krause wrote:
Is there a known issue with the PCI on the MPC5200, and more specifically with PCI network cards ?
I also have problems with some PCI cards. Some are recognized, some not. I haven't found an explanation, yet. I guess it has something to do with some "3.3 V compatible" cards are not really compatible with 3.3 V only systems. It could as well be an errata in the MPC5200 described in the MPC5200 Errata Listing:
ID 322: Violation of PCI Tval min time
The PCI Timing Speci?cation de?nes the timing parameter Tval (CLK to Signal Valid Delay): Tval min 2 ns, max 11 ns (33MHz) Tval min 2 ns, max 6 ns (66MHz) When M66EN is asserted, the minimum speci?cation for Tval(min) may be reduced to 1 ns if a mechanism is provided to guarantee a minimum value of 2 ns when M66EN is deasserted. MPC5200 provides Tval min of 1 ns (instead of 2 ns), which is a violation of the Timing Speci?cation for 33MHz.
Yes, some cards are not detected because of this errata. Please note that this only happens if the card / chipset used is also not PCI timing spec compliant. A compliant card / chipset needs to be able to handle 0 ns Tval(min). And some cards say "3.3 V compatible" but they aren't because either 3.3 V is simply not enough or they do nasty things like shortening the 5 V and 3.3 V power supply. That's always worth a check before inserting the card in a 3.3 V / 5 V system.
participants (2)
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Mark Jonas -
Martin Krause