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doc: vxworks: Update x86 specific instructions

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This updates the doc of booting VxWorks, like loading an x64 kernel,
and how to make VxWorks graphics console driver work.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Bin Meng 2018-04-11 22:02:23 -07:00
parent 79c584e559
commit 7d9974a2be
1 changed files with 19 additions and 2 deletions
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doc/README.vxworks
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@ -17,8 +17,6 @@ For booting old kernels (6.9.x) on PowerPC and ARM, and all kernel versions
on other architectures, 'bootvx' shall be used. For booting VxWorks 7 kernels
on PowerPC and ARM, 'bootm' shall be used.
64-bit x86 kernel cannot be loaded as of today.
VxWorks 7 on PowerPC and ARM
---------------------------
From VxWorks 7, VxWorks starts adopting device tree as its hardware decription
@ -79,3 +77,22 @@ For boards on which ACPI is not supported by U-Boot yet, VxWorks kernel must
be configured to use MP table and virtual wire interrupt mode. This requires
INCLUDE_MPTABLE_BOOT_OP and INCLUDE_VIRTUAL_WIRE_MODE to be included in a
VxWorks kernel configuration.
Both 32-bit x86 and 64-bit x64 kernels can be loaded.
There are two types of graphics console drivers in VxWorks. One is the 80x25
VGA text mode driver. The other one is the EFI console bitmapped graphics mode
driver. To make these drivers function, U-Boot needs to load and run the VGA
BIOS of the graphics card first.
- If the kernel is configured with 80x25 VGA text mode driver,
CONFIG_FRAMEBUFFER_SET_VESA_MODE must be unset in U-Boot.
- If the kernel is configured with bitmapped graphics mode driver,
CONFIG_FRAMEBUFFER_SET_VESA_MODE need remain set but care must be taken
at which VESA mode is to be set. The supported pixel format is 32-bit
RGBA, hence the available VESA mode can only be one of the following:
* FRAMEBUFFER_VESA_MODE_10F
* FRAMEBUFFER_VESA_MODE_112
* FRAMEBUFFER_VESA_MODE_115
* FRAMEBUFFER_VESA_MODE_118
* FRAMEBUFFER_VESA_MODE_11B