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| author | Bin Meng <bmeng.cn@gmail.com> | 2016-05-11 14:45:06 (GMT) |
|---|---|---|
| committer | Bin Meng <bmeng.cn@gmail.com> | 2016-05-23 07:18:00 (GMT) |
| commit | 5a6a2c714e74ba18ebd6f890f5f60dc7f0bb0a72 (patch) | |
| tree | 8246789b26caaf70589cf5af70649c988746ddf7 | |
| parent | 10fcabed8857d2c12a5806c68cf884802f975aae (diff) | |
| download | u-boot-fsl-qoriq-5a6a2c714e74ba18ebd6f890f5f60dc7f0bb0a72.tar.xz | |
x86: doc: Update information about IGD with SeaBIOS
Document how to make SeaBIOS load and run the VGA ROM of Intel
IGD device when loaded by U-Boot.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
| -rw-r--r-- | doc/README.x86 | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/doc/README.x86 b/doc/README.x86 index 25cb218..250d5a3 100644 --- a/doc/README.x86 +++ b/doc/README.x86 @@ -807,6 +807,30 @@ to install/boot a Windows XP OS (below for example command to install Windows). This is also tested on Intel Crown Bay board with a PCIe graphics card, booting SeaBIOS then chain-loading a GRUB on a USB drive, then Linux kernel finally. +If you are using Intel Integrated Graphics Device (IGD) as the primary display +device on your board, SeaBIOS needs to be patched manually to get its VGA ROM +loaded and run by SeaBIOS. SeaBIOS locates VGA ROM via the PCI expansion ROM +register, but IGD device does not have its VGA ROM mapped by this register. +Its VGA ROM is packaged as part of u-boot.rom at a configurable flash address +which is unknown to SeaBIOS. An example patch is needed for SeaBIOS below: + +diff --git a/src/optionroms.c b/src/optionroms.c +index 65f7fe0..c7b6f5e 100644 +--- a/src/optionroms.c ++++ b/src/optionroms.c +@@ -324,6 +324,8 @@ init_pcirom(struct pci_device *pci, int isvga, u64 *sources) + rom = deploy_romfile(file); + else if (RunPCIroms > 1 || (RunPCIroms == 1 && isvga)) + rom = map_pcirom(pci); ++ if (pci->bdf == pci_to_bdf(0, 2, 0)) ++ rom = (struct rom_header *)0xfff90000; + if (! rom) + // No ROM present. + return; + +Note: the patch above expects IGD device is at PCI b.d.f 0.2.0 and its VGA ROM +is at 0xfff90000 which corresponds to CONFIG_VGA_BIOS_ADDR on Minnowboard MAX. +Change these two accordingly if this is not the case on your board. Development Flow ---------------- |