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

10 Jan 2005

      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@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@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@lists.sourceforge.net 
[mailto:u-boot-users-admin@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@arabellasw.com | Fax   +972-9-765-7494 | Arabella 
Software, Israel
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