Can you elaborate on how pci bus is mapped into local bus?
Is there specification publicly available? Google didn't tell me.
On Wed, Jun 30, 2010 at 06:39:53PM +0800, Huacai Chen wrote:
> It seems like software may both use CPU address or PCI address to access a PCI
> device. For example, Bonito north bridge map PCI memory space at 0x10000000 ~
> 0x1C000000. PMON code use 0x00000000 ~ 0x0C000000, but Linux kernel code use
> 0x10000000 ~ 0x1C000000 to access devices. If set pci_mem_base to 0, PMON
> can't
> work, but if set pci_mem_base to 0x10000000, Linux can't access PCI. So I make
> this patch to make both cases works.
>
> However, I don't know whether the modification will break other archs, so
> request for comments here.
>
> Signed-off-by: Huacai Chen <zltjiang...@gmail.com>
> ---
> hw/pci.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/hw/pci.c b/hw/pci.c
> index 7787005..50e3572 100644
> --- a/hw/pci.c
> +++ b/hw/pci.c
> @@ -672,7 +672,7 @@ PCIDevice *pci_register_device(PCIBus *bus, const char
> *name,
> static target_phys_addr_t pci_to_cpu_addr(PCIBus *bus,
> target_phys_addr_t addr)
> {
> - return addr + bus->mem_base;
> + return addr | bus->mem_base;
> }
>
> static void pci_unregister_io_regions(PCIDevice *pci_dev)
> --
> 1.7.0.4
>
--
yamahata
