[U-Boot-Users] MPC8272ADS PCI limitation in u-boot

[Rune Torgersen]

I have seen that exact problem multiple times. I found one good way to
get that fixed on out internal 8265 port to a custom board.

I found that on our 8265 board, all IO resources have the lowest bit
set.
Changing m8260_find_bridges (in 2.6.9) to
(arch/ppc/syslib/m8260_pci.c
(psuedo patch)
        pci_init_resource(&hose->io_resource,
			  MPC826x_PCI_LOWER_IO,
			  MPC826x_PCI_UPPER_IO,
-			  IORESOURCE_IO, "PCI I/O");
+			  IORESOURCE_IO | 1, "PCI I/O"); // the 1 added
so IO areas work.


Helped for me. Now it newer compalins about resources.
Also had to make sure that memory map for PCI matched between u-boot and
linux.
Still havent gotten around to fix the allocation under u-boot (or linux)
to allocate prefetchable memory where needed.

> -----Original Message-----
> From: Milligan, Keath [mailto:kmilligan at austin.polycom.com] 
> Sent: Monday, January 10, 2005 13:19
> To: Rune Torgersen; Yuli Barcohen; Milligan, Keath
> Cc: U-Boot
> Subject: RE: [U-Boot-Users] MPC8272ADS PCI limitation in u-boot
> 
> This seems to be the case. Basically, the issue I am having 
> is that when I
> attempt to boot Linux, my PCI devices aren't getting mapped 
> properly. Linux
> attempts to map some, but gives up saying it can not allocate 
> the regions.
> This would seem to suggest that the firmware/boot-loader 
> needs to deal with
> it.
> 
> The same hardware, when connected to a PC, gets mapped and 
> works correctly
> under x86 Linux.
> 
> -----Original Message-----
> From: Rune Torgersen [mailto:runet at innovsys.com] 
> Sent: Monday, January 10, 2005 8:36 AM
> To: Yuli Barcohen; Milligan, Keath
> Cc: U-Boot
> Subject: RE: [U-Boot-Users] MPC8272ADS PCI limitation in u-boot
> 
> Actually the MPC8266ADS port (MPC8266ADS_config, separate 
> from the rest
> of the PQII boards) does do PCI initializatiopn (at least a very crude
> one) It only allocates non-prefetchable memory (even for placess where
> prefetchable should be used).
> 
> > -----Original Message-----
> > From: u-boot-users-admin at lists.sourceforge.net 
> > [mailto:u-boot-users-admin at lists.sourceforge.net] On Behalf 
> > Of Yuli Barcohen
> > Sent: Friday, January 07, 2005 17:47
> > To: Milligan, Keath
> > Cc: U-Boot
> > Subject: Re: [U-Boot-Users] MPC8272ADS PCI limitation in u-boot
> > 
> > U-Boot port for MPC82xxADS family does not initialise PCI 
> > bridge at all
> > because it's not necessary for booting the board. Where did 
> > you find PCI
> > windows initialisations? Regarding the bridge limitations, 
> > AFAIK you can
> > do what you want but please consult MPC8272 user's guide.
> > 
> > -- 
> > ==============================================================
> > ==========
> >  Yuli Barcohen       | Phone +972-9-765-1788 |  Software 
> > Project Leader
> >  yuli at arabellasw.com | Fax   +972-9-765-7494 | Arabella 
> > Software, Israel
> > ==============================================================
> > ==========
> > 
> > 
> > 
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> 
>