On Thu, Nov 05, 2009 at 06:34:56PM -0600, Bjorn Helgaas wrote: [ big snip ] > > Of course, this doesn't help if you actually power off the slot or > press your reset button. In that case, we have to assign things from > scratch, and we really need to know what the host bridge apertures are. > It'd be best if the BIOS gave us an ACPI description, so we could just > use "pci=use_crs". Without that, I think we'll need a host bridge > driver to read them out of the hardware, and it sounds like we don't > have the specs required to write such a driver. > What would actually be needed to write this driver? I ran an the command "lspci -MH1 -vv -xxx", which I found in a very old email. It manages to dump out all 0x100 bytes of configuration space on the bridges. Using this and lspci, it is clear what memory lives behind the bridge, I think. Here is a dump from my Force computer's Broadcom host bridges. Look closely at the 4 16-bit registers starting at 0xC0. If you correlate them with the BAR dump, shown below, it shows: Bridge 00:00.0 non-prefetchable memory from 0xf9000000 - 0xf93fffff prefectchable memory from 0xf9400000 - 0xf96fffff Bridge 00:00.1 non-prefetchable memory from 0xf98c0000 - 0xfaffffff prefectchable memory from NONE PRESENT 00:00.0 Host bridge: Broadcom CNB20LE Host Bridge (rev 06) Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ >SERR- <PERR- Latency: 48, Cache Line Size: 32 bytes 00: 66 11 09 00 06 01 00 22 06 00 00 06 08 30 80 00 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 40: 00 00 00 00 00 01 04 00 81 14 00 2f 00 00 00 6e 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 70: 20 aa 80 aa 00 00 00 00 01 0c 81 00 88 00 00 00 80: 00 10 10 20 00 00 00 00 00 00 00 00 00 00 00 00 90: ff 00 09 10 ff 6f 70 31 00 00 00 00 00 00 00 00 a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 b0: cf ff fc fb ff df ee ff bf dd d7 fe bf f7 ff df c0: 00 f9 3f f9 40 f9 6f f9 00 00 00 00 0d 07 00 48 d0: 00 10 0c 14 00 00 00 00 00 00 00 00 01 80 10 93 e0: 04 90 00 07 00 00 00 00 81 00 00 00 00 00 00 00 f0: 48 45 00 00 00 00 00 00 00 00 00 00 60 00 00 00 00:00.1 Host bridge: Broadcom CNB20LE Host Bridge (rev 06) Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- Latency: 64, Cache Line Size: 32 bytes 00: 66 11 09 00 07 01 00 02 06 00 00 06 08 40 80 00 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 40: 00 00 00 00 02 02 00 00 00 00 00 4b 00 00 00 00 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 c0: 8c f9 ff fa 00 00 00 00 00 00 00 00 01 00 00 00 d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f0: 80 81 19 09 00 00 00 00 00 00 00 00 61 00 00 00 And here is the full listing of PCI BAR addresses: 00:00.0 Host bridge: Broadcom CNB20LE Host Bridge (rev 06) Flags: bus master, medium devsel, latency 48 00:00.1 Host bridge: Broadcom CNB20LE Host Bridge (rev 06) Flags: bus master, medium devsel, latency 64 00:01.0 Ethernet controller: Intel Corporation 8255xER/82551IT Fast Ethernet Controller (rev 09) Subsystem: Intel Corporation Device 100c Flags: bus master, medium devsel, latency 66, IRQ 11 Memory at f9020000 (32-bit, non-prefetchable) [size=4K] I/O ports at 1080 [size=64] Memory at f9000000 (32-bit, non-prefetchable) [size=128K] [virtual] Expansion ROM at 20000000 [disabled] [size=1M] Capabilities: <access denied> Kernel driver in use: e100 00:02.0 Ethernet controller: Intel Corporation 8255xER/82551IT Fast Ethernet Controller (rev 09) Subsystem: Intel Corporation Device 100c Flags: bus master, medium devsel, latency 66, IRQ 10 Memory at f9021000 (32-bit, non-prefetchable) [size=4K] I/O ports at 10c0 [size=64] Memory at f9040000 (32-bit, non-prefetchable) [size=128K] [virtual] Expansion ROM at 20100000 [disabled] [size=1M] Capabilities: <access denied> Kernel driver in use: e100 00:04.0 PCI bridge: Force Computers Device 0001 (rev 01) (prog-if 00 [Normal decode]) Flags: bus master, medium devsel, latency 64 Memory at f9022000 (32-bit, non-prefetchable) [size=4K] I/O ports at 1000 [size=128] Bus: primary=00, secondary=01, subordinate=01, sec-latency=64 Memory behind bridge: f9100000-f91fffff Prefetchable memory behind bridge: f9400000-f96fffff Capabilities: <access denied> 00:0f.0 ISA bridge: Broadcom OSB4 South Bridge (rev 50) Subsystem: Broadcom OSB4 South Bridge Flags: bus master, medium devsel, latency 0 Kernel driver in use: piix4_smbus 00:0f.1 IDE interface: Broadcom OSB4 IDE Controller (prog-if 8a [Master SecP PriP]) Flags: medium devsel [virtual] Memory at 000001f0 (32-bit, non-prefetchable) [size=8] [virtual] Memory at 000003f0 (type 3, non-prefetchable) [size=1] [virtual] Memory at 00000170 (32-bit, non-prefetchable) [size=8] [virtual] Memory at 00000370 (type 3, non-prefetchable) [size=1] I/O ports at 1400 [size=16] 00:0f.2 USB Controller: Broadcom OSB4/CSB5 OHCI USB Controller (rev 04) (prog-if 10 [OHCI]) Subsystem: Broadcom OSB4/CSB5 OHCI USB Controller Flags: medium devsel, IRQ 7 Memory at f9023000 (32-bit, non-prefetchable) [size=4K] 01:0b.0 Power PC: Freescale Semiconductor Inc MPC8349E (rev 30) Flags: 66MHz, fast devsel, IRQ 9 Memory at f9100000 (32-bit, non-prefetchable) [size=1M] Memory at f9600000 (32-bit, prefetchable) [size=4K] Memory at f9500000 (64-bit, prefetchable) [size=1M] Memory at f9400000 (64-bit, prefetchable) [size=1M] Capabilities: <access denied> 02:03.0 VGA compatible controller: Chips and Technologies F69030 (rev 61) (prog-if 00 [VGA controller]) Subsystem: Chips and Technologies F69030 Flags: stepping, 66MHz, medium devsel, IRQ 9 Memory at fa000000 (32-bit, non-prefetchable) [size=16M] [virtual] Expansion ROM at 20200000 [disabled] [size=256K] Any thoughts on this? I put in a request on Broadcom's support form asking for the documentation of the config space. We'll see what they say. Ira -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
