Hi,
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
--
Cordialement,
Nicolas MEDERLE.
Hi Nicolas,
On Wednesday 11 July 2007 17:39, Nicolas Mederle wrote:
Hi,
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.
You should ioremap() the memory you want to access, and use the I/O access
functions defined in asm/io.h. Don't forget to iounmap() once you're done.
Best regards,
Laurent Pinchart
Hi,
You could call *io_block_mapping* function from your setup.c file that will
add the entry into MMU.
regards
Bhupi
On 7/11/07, Nicolas Mederle [off-list ref] wrote:
Hi,
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
--
Cordialement,
Nicolas MEDERLE.
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Linuxppc-embedded@ozlabs.org
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On Wed, 2007-07-11 at 09:32 -0700, Bhupender Saharan wrote:
Hi,
You could call io_block_mapping function from your setup.c file that
will add the entry into MMU.
io_block_mapping doesn't exist in the arch/powerpc tree.
josh