PageFault when I write in the Serial registers, MMU ?
bhupi.saharan at gmail.com
Thu Jul 12 02:32:59 EST 2007
You could call *io_block_mapping* function from your setup.c file that will
add the entry into MMU.
On 7/11/07, Nicolas Mederle <mederle_nicolas at yahoo.fr> wrote:
> I am porting linux on a custom board equipped with a PPC750, and I
> will like to have some advices on the MMU. I used the powerpc arch, and
> I built my device tree.
> I will like to know in which files we can configure the
> authorizations access for the I/O registers. When I use the function
> md_ppc.progress, I have a data access fault. I modified the head. S
> files, for add the BAT config. But I think that it is not correct, and
> that it is possible to do it elsewhere (platform_init?). Moreover the
> kernel modify the MMU config, it removes the BATs, and configures the
> Registers Segments. So, must I remake the configuration? Or is it
> possible to indicate, at the beginning, which space is reserved for I/O?
> I studied several patch (sandpoint, PrPMC2800) but none configures
> really the MMU for I/O registers. In the same way, I read several books,
> but I am not able to have information that I seek, therefore I am really
> blocked. I warmly thank you for the assistance which you will be able to
> bring to me.
> Mapping : 0x0000 0000 -> 0x0FFF FFFF : RAM
> 0x2000 0000 -> 0x201F FFFF : ASIC (
> UART, DMA, GPIO, PIC...)
> 0x8000 0000 -> 0x8FFF FFFF : PCI
> 0xF000 0000 -> 0xFFFF FFFF : Flash
> The kernel is load at 0x0, an the system is a Run In Memory.
> Currently, I don't use the flash.
> Best regards,
> Nicolas MEDERLE
> Nicolas MEDERLE.
> Linuxppc-embedded mailing list
> Linuxppc-embedded at ozlabs.org
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