Thank you the pointer. I found the followings. https://groups.google.com/group/archlinux-for-loongson/web/loongson https://groups.google.com/group/archlinux-for-loongson/web/bonito64-spec.pdf Am I referring to a correct spec?
According to it, [0x00000000, 0x10000000) RAM [0x10000000, 0x14000000) PCI_Lo0 [0x14000000, 0x18000000) PCI_Lo1 [0x18000000, 0x1c000000) PCI_Lo2 [0x20000000, 0x80000000) PCI_1.5 [0x80000000, 0x100000000) PCI_2 [0x00000000, 0x0c000000) in physical address is RAM, so I don't understand PMON uses the area. I may be misunderstanding something. Can you elaborate please? PCI_Lo[123] is interesting. The base address can be programmed independently. Such operation isn't assumed by qemu. On Wed, Jun 30, 2010 at 10:05:55PM +0800, chen huacai wrote: > Maybe this is what you want, please look at Page 10. > http://people.openrays.org/~comcat/godson/doc/godson2e.north.bridge.manual.pdf > But it is written in Chinese, I'm sorry that I also don't have an > English version. > > > On Wed, Jun 30, 2010 at 9:38 PM, Isaku Yamahata <yamah...@valinux.co.jp> > wrote: > > 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 > > > > > > -- > Huacai Chen > -- yamahata
