smallsolar/u-boot
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

bootvx: x86: Prepare e820 related stuff from the given kernel memory base address

Browse Source 
At present two environment variables 'e820data'/'e820info' are required
to boot a VxWorks x86 kernel, but this is superfluous. The offset of
these two tables are actually at a fixed offset from the kernel memory
base address and we can provide the kernel memory base address to U-Boot
via only one variable 'vx_phys_mem_base'.

Note as it name indicates, the physical address should be provided.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
This commit is contained in:
Bin Meng
2018-04-11 22:02:07 -07:00
parent 2ad3d088d2
commit 2902be86c1
3 changed files with 22 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
doc/README.vxworks
View File

@@ -67,17 +67,13 @@ look like VxWorks hangs somewhere as nothing outputs on the serial console.
x86-specific information
------------------------
Before loading an x86 kernel, two additional environment variables need to be
provided. They are "e820data" and "e820info", which represent the address of
E820 table and E820 information (defined by VxWorks) in system memory.
Before loading an x86 kernel, one additional environment variable need to be
provided. This is "vx_phys_mem_base", which represent the physical memory
base address of VxWorks.
Check VxWorks kernel configuration to look for BIOS_E820_DATA_START and
BIOS_E820_INFO_START, and assign their values to "e820data" and "e820info"
accordingly. If neither of these two are supplied, U-Boot assumes a default
location at 0x4000 for "e820data" and 0x4a00 for "e820info". Typical values
for "e820data" and "e820info" are 0x104000 and 0x104a00. But there is one
exception on Intel Galileo, where "e820data" and "e820info" should be left
unset, which assume the default location for VxWorks.
Check VxWorks kernel configuration to look for LOCAL_MEM_LOCAL_ADRS. For
VxWorks 7, this is normally a virtual address and you need find out its
corresponding physical address and assign its value to "vx_phys_mem_base".
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