Vitaly,
I'm using a linux 2.4.31 kernel. In the present situation I have BRx/ORx
well configured and i can boot u-boot normally and without problems. I have a
flash eprom with base address 0xD0000000 and a FPGA in 0xE0000000. In linux, i
have the mtd driver similar to the rpxlite board. cfi_probe doesn't find my
flash eprom. My colleague developped an fpga driver, but he can't access it
either... It seem's that all the addresses that we try to access are all
mixed-up. In ppc_md.map_io, i'm doing io_block_mapping for the CPM (from
0xf0000000 to the end of memory) , 0x80000000 and 0xa0000000 for PCI address
space, both with 256MB of length. We are a bit lost... It seems that we forgot
something to do. Can you help me on this?
Best regards,
Filipe.
-----Mensagem original-----
De: linuxppc-embedded-bounces at ozlabs.org em nome de Vitaly Bordug
Enviada: sex 27-01-2006 13:37
Para: Jose Fran?a (Ext_GTBC)
Cc: linuxppc-embedded at ozlabs.org
Assunto: Re: HELP! Memory mapping and address space doubts
Jose,
Can you please be a bit more specific in targets you want to achieve?
An example how to setup br/or and use the device could be found as a
part of PQ2 PCI support,
where interrupt controller is implemented as a CPLD device
(arch/ppc/syslib/m82xx_pci.{c,h}).
On Thu, 26 Jan 2006 14:04:49 -0000
Jose Fran?a (Ext_GTBC) <Jose.Franca.Ext at siemens.com> wrote:
> Hello u all!
>
> I need to clarify some aspects of the memory management in ppc
linux and i hope that you could help me.
> Lets imagine we have a mpc8272 based board with 3 devices A, B
and C.In the bootloader (in my case, i use u-boot), i configured the BRx and
Orx so that A has base address X, B has base address Y and C has base address
Z. My first doubt arrises here: what address should i use? Being SDRAM base
address 0x00000000 and kernel base address 0xC0000000, where will i put these
devices mapped on? Above 0xC0000000 or in between the end of physical memory
and 0xC0000000? Do i really need to configure the BAT registers in u boot?
> In linux 2.4 kernel, we have ppc_md.setup_io_mappings to map
address blocks into the BAT registers... As i observed in the kernel source
tree examples, we must map CPM (why?). And what about the other devices A, B
and C? How will i setup them in this case and what addresses i can use? Above
0xC0000000 or in between the end of physical memory and 0xC0000000? Is the
SDRAM included?
>
> Thanks in advance to all contributions! All of them will be
most welcomed!
>
>
>
>
>
> Best regards,
> Filipe
>
> _______________________________________________
> Linuxppc-embedded mailing list
> Linuxppc-embedded at ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-embedded
>
>
--
Sincerely,
Vitaly
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