AW: [U-Boot-Users] LITE5200 board: Bus Fault with 2 network cards

AW: [U-Boot-Users] LITE5200 board: Bus Fault with 2 network cards

[Martin Krause]

Hi Olivier,

> -----Urspr?ngliche 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.

Best Regards,
Martin

AW: [U-Boot-Users] LITE5200 board: Bus Fault with 2 network cards

[Reinhard Meyer]

Hello,

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!

Reinhard

-----Urspr?ngliche Nachricht-----
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

Hi Olivier,

> -----Urspr?ngliche 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.

Best Regards,
Martin


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AW: [U-Boot-Users] LITE5200 board: Bus Fault with 2 network cards

[Mark Jonas]

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.