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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/README.sbc8349 | 50 |
1 files changed, 34 insertions, 16 deletions
diff --git a/doc/README.sbc8349 b/doc/README.sbc8349 index 908e768..2c35919 100644 --- a/doc/README.sbc8349 +++ b/doc/README.sbc8349 @@ -91,19 +91,37 @@ safety check before resetting the board upon completion of the reflash. PCI: ==== -This board and U-Boot have been tested with PCI built in, on a SBC8349 -and confirmed that the "pci" command showed the intel e1000 that was -present in the PCI slot. Note that if a 33MHz 32bit card is inserted -in the slot, then the whole board will clock down to a 33MHz base -clock instead of the default 66MHz. This will change the baud clocks -and mess up your serial console output. If you want to use a 33MHz PCI -card, then you should build a U-Boot with #undef PCI_66M in the -include/configs/sbc8349.h and store this to flash prior to powering down -the board and inserting the 33MHz PCI card. - -By default PCI support is disabled to better support very early -revision MPC834x chips with possible PCI issues. Also PCI support is -untested on the sbc8347 variants at this point in time. - - - Paul Gortmaker, 01/2007 +There are three configuration choices: + sbc8349_config + sbc8349_PCI_33_config + sbc8349_PCI_66_config + +The 1st does not enable CONFIG_PCI, and assumes that the PCI slot +will be left empty (M66EN high), and so the board will operate with +a base clock of 66MHz. Note that you need both PCI enabled in u-boot +and linux in order to have functional PCI under linux. The only +reason for choosing to not enable PCI would be if you had a very +early (rev 1.0) CPU with possible PCI issues. + +The second enables PCI support and builds for a 33MHz clock rate. Note +that if a 33MHz 32bit card is inserted in the slot, then the whole board +will clock down to a 33MHz base clock instead of the default 66MHz. This +will change the baud clocks and mess up your serial console output if you +were previously running at 66MHz. If you want to use a 33MHz PCI card, +then you should build a U-Boot with sbc8349_PCI_33_config and store this +to flash prior to powering down the board and inserting the 33MHz PCI +card. + +The third option builds PCI support in, and leaves the clocking at the +default 66MHz. This has been tested with an intel PCI-X e1000 card. +This is also the appropriate choice for people with a recent (non 1.0) +CPU who currently have the PCI slot physically empty, but intend to +possibly add a PCI-X card at a later date. + + => pci + Scanning PCI devices on bus 0 + BusDevFun VendorId DeviceId Device Class Sub-Class + _____________________________________________________________ + 00.00.00 0x1957 0x0080 Processor 0x20 + 00.11.00 0x8086 0x1026 Network controller 0x00 + => |