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| author | Bin Meng <bmeng.cn@gmail.com> | 2018-04-11 22:02:07 -0700 |
|---|---|---|
| committer | Bin Meng <bmeng.cn@gmail.com> | 2018-04-16 16:54:51 +0800 |
| commit | 2902be86c1496244800ee15a148a4907bf9a3492 (patch) | |
| tree | a654074e5d69612b7dfe44a496e0ea8c9e7105a2 /doc | |
| parent | 2ad3d088d2177908bd9bc7a988bd75fe55c6874c (diff) | |
| download | u-boot-2902be86c1496244800ee15a148a4907bf9a3492.zip u-boot-2902be86c1496244800ee15a148a4907bf9a3492.tar.gz u-boot-2902be86c1496244800ee15a148a4907bf9a3492.tar.bz2 | |
bootvx: x86: Prepare e820 related stuff from the given kernel memory base address
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>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/README.vxworks | 18 |
1 files changed, 7 insertions, 11 deletions
diff --git a/doc/README.vxworks b/doc/README.vxworks index 6700e1d..3f9b8c1 100644 --- a/doc/README.vxworks +++ b/doc/README.vxworks @@ -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. - -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. +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 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 |