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x86: Update README.x86 for SMP support

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Document U-Boot multi-processor support as well as configuration
tables like SFI and MP tables for SMP OS kernel.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
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Bin Meng 2015-06-23 12:18:53 +08:00 committed by Simon Glass
parent 07545d861c
commit 1281a1fc97
1 changed files with 13 additions and 0 deletions
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doc/README.x86
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@ -258,6 +258,17 @@ Modern CPUs usually require a special bit stream called microcode [6] to be
loaded on the processor after power up in order to function properly. U-Boot
has already integrated these as hex dumps in the source tree.
SMP Support
-----------
On a multicore system, U-Boot is executed on the bootstrap processor (BSP).
Additional application processors (AP) can be brought up by U-Boot. In order to
have an SMP kernel to discover all of the available processors, U-Boot needs to
prepare configuration tables which contain the multi-CPUs information before
loading the OS kernel. Currently U-Boot supports generating two types of tables
for SMP, called Simple Firmware Interface (SFI) [7] and Multi-Processor (MP) [8]
tables. The writing of these two tables are controlled by two Kconfig options
GENERATE_SFI_TABLE and GENERATE_MP_TABLE.
Driver Model
------------
x86 has been converted to use driver model for serial and GPIO.
@ -362,3 +373,5 @@ References
[4] http://www.intel.com/content/www/us/en/embedded/design-tools/evaluation-platforms/atom-e660-eg20t-development-kit.html
[5] http://www.intel.com/fsp
[6] http://en.wikipedia.org/wiki/Microcode
[7] http://simplefirmware.org
[8] http://www.intel.com/design/archives/processors/pro/docs/242016.htm