AW: [U-Boot-Users] LITE5200 board: Bus Fault with 2 network cards
reinhard.meyer at emk-elektronik.de
Tue Jul 13 09:15:27 CEST 2004
Be highly cautious with PCI cards that claim 3.3V compatibility by having a notch in the 3.3V key position. Many of them still locally bridge the 5V and the VIO powers!
Von: u-boot-users-admin at lists.sourceforge.net [mailto:u-boot-users-admin at lists.sourceforge.net] Im Auftrag von Martin Krause
Gesendet: Dienstag, 13. Juli 2004 09:00
An: Olivier Singla
Cc: u-boot-users at lists.sourceforge.net
Betreff: AW: [U-Boot-Users] LITE5200 board: Bus Fault with 2 network cards
> -----Ursprüngliche Nachricht-----
> Von: Olivier Singla [mailto:olivier at singla.us]
> Gesendet: Dienstag, 13. Juli 2004 04:12
> An: u-boot-users at 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.
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