[U-Boot] [PATCH 26/26] x86: doc: Document ACPI support

[Bin Meng]

Remove ACPI from the TODO list and add a new section to document
current ACPI support in U-Boot.

Signed-off-by: Bin Meng <bmeng.cn at gmail.com>

---

 doc/README.x86 | 36 +++++++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/doc/README.x86 b/doc/README.x86
index a5dfb86..d74e6e4 100644
--- a/doc/README.x86
+++ b/doc/README.x86
@@ -957,12 +957,44 @@ transformations. Remember to add attribution to coreboot for new files added
 to U-Boot. This should go at the top of each file and list the coreboot
 filename where the code originated.
 
+ACPI Support Status
+-------------------
+Advanced Configuration and Power Interface (ACPI) [16] aims to establish
+industry-standard interfaces enabling OS-directed configuration, power
+management, and thermal management of mobile, desktop, and server platforms.
+
+Linux can boot without ACPI with "acpi=off" command line parameter, but
+with ACPI the kernel gains the capabilities to handle power management.
+For Windows, ACPI is a must-have firmware feature since Windows Vista.
+CONFIG_GENERATE_ACPI_TABLE is the config option to turn on ACPI support in
+U-Boot. This requires Intel ACPI compiler to be installed on your host to
+compile ACPI DSDT table written in ASL format to AML format. You can get
+the compiler via "apt-get install iasl" if you are on Ubuntu or download
+the source from [17] to compile one by yourself.
+
+Current ACPI support in U-Boot is not complete. More features will be added
+in the future. The status as of today is:
+
+ * Support generating RSDT, XSDT, FACS, FADT, MADT, MCFG tables.
+ * Support one static DSDT table only, compiled by Intel ACPI compiler.
+ * Support S0/S5 only, no S3/S4 boot path support yet.
+ * No ACPI global NVS support (this can be optional, but we may need it in
+   the future to simplify ASL code logic when utilizing NVS variables).
+ * No dynamic AML bytecodes insertion at run-time (this is optional as we
+   can always describe the board in the static way).
+ * All ACPI interrupts are routed to SCI for OS to handle. No legacy SMI
+   implementation within U-Boot.
+ * Install Ubuntu from U-Boot plus SeaBIOS does not work.
+ * Install Windows 8.1/10 from U-Boot plus SeaBIOS does not work.
+
+So far ACPI is enabled on BayTrail based boards. Testing was done by booting
+a pre-installed Ubuntu 14.04 from a SATA drive. Most devices seem to work
+correctly and the board can respond a reboot/shutdown command from Ubuntu.
 
 TODO List
 ---------
 - Audio
 - Chrome OS verified boot
-- SMI and ACPI support, to provide platform info and facilities to Linux
 
 References
 ----------
@@ -981,3 +1013,5 @@ References
 [13] http://events.linuxfoundation.org/sites/events/files/slides/elce-2014.pdf
 [14] http://www.seabios.org/SeaBIOS
 [15] doc/device-tree-bindings/misc/intel,irq-router.txt
+[16] http://www.acpi.info
+[17] https://www.acpica.org/downloads
-- 
1.8.2.1