usb: xhci: Change xhci_setup_addressable_virt_dev() signature

[people/ms/u-boot.git] / doc / README.x86

diff --git a/doc/README.x86 b/doc/README.x86
index ba5bb99dcd1a7edb5ef0bd135d8b1451786c141f..c69dc1c511341501d3a3e5c5ae904c2ee2e10fcb 100644 (file)
--- a/doc/README.x86
+++ b/doc/README.x86
@@ -381,10 +381,17 @@ To enable video you must enable these options in coreboot:
    - Set framebuffer graphics resolution (1280x1024 32k-color (1:5:5))
    - Keep VESA framebuffer
 
+And include coreboot_fb.dtsi in your board's device tree source file, like:
+
+   /include/ "coreboot_fb.dtsi"
+
 At present it seems that for Minnowboard Max, coreboot does not pass through
 the video information correctly (it always says the resolution is 0x0). This
 works correctly for link though.
 
+Note: coreboot framebuffer driver does not work on QEMU. The reason is unknown
+at this point. Patches are welcome if you figure out anything wrong.
+
 Test with QEMU for bare mode
 ----------------------------
 QEMU is a fancy emulator that can enable us to test U-Boot without access to
@@ -446,7 +453,7 @@ loading kernel to address 01000000 size 5d9d30 initrd 04000000 size 1b1ab50
 Here the kernel (bzImage) is loaded to 01000000 and initrd is to 04000000. Then,
 'zboot' can be used to boot the kernel:
 
-=> zboot 02000000 - 04000000 1b1ab50
+=> zboot 01000000 - 04000000 1b1ab50
 
 CPU Microcode
 -------------
@@ -1007,12 +1014,12 @@ 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:
+Current ACPI support in U-Boot is basically complete. More optional features
+can 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, reboot and shutdown from OS.
+ * Support S0/S3/S4/S5, reboot and shutdown from OS.
  * Support booting a pre-installed Ubuntu distribution via 'zboot' command.
  * Support installing and booting Ubuntu 14.04 (or above) from U-Boot with
    the help of SeaBIOS using legacy interface (non-UEFI mode).
@@ -1020,9 +1027,6 @@ in the future. The status as of today is:
    of SeaBIOS using legacy interface (non-UEFI mode).
  * Support ACPI interrupts with SCI only.
 
-Features not supported so far (to make it a complete ACPI solution):
- * S3 (Suspend to RAM), S4 (Suspend to Disk).
-
 Features that are optional:
  * Dynamic AML bytecodes insertion at run-time. We may need this to support
    SSDT table generation and DSDT fix up.
@@ -1039,6 +1043,21 @@ command from the OS.
 For other platform boards, ACPI support status can be checked by examining their
 board defconfig files to see if CONFIG_GENERATE_ACPI_TABLE is set to y.
 
+The S3 sleeping state is a low wake latency sleeping state defined by ACPI
+spec where all system context is lost except system memory. To test S3 resume
+with a Linux kernel, simply run "echo mem > /sys/power/state" and kernel will
+put the board to S3 state where the power is off. So when the power button is
+pressed again, U-Boot runs as it does in cold boot and detects the sleeping
+state via ACPI register to see if it is S3, if yes it means we are waking up.
+U-Boot is responsible for restoring the machine state as it is before sleep.
+When everything is done, U-Boot finds out the wakeup vector provided by OSes
+and jump there. To determine whether ACPI S3 resume is supported, check to
+see if CONFIG_HAVE_ACPI_RESUME is set for that specific board.
+
+Note for testing S3 resume with Windows, correct graphics driver must be
+installed for your platform, otherwise you won't find "Sleep" option in
+the "Power" submenu from the Windows start menu.
+
 EFI Support
 -----------
 U-Boot supports booting as a 32-bit or 64-bit EFI payload, e.g. with UEFI.
@@ -1070,7 +1089,6 @@ TODO List
 ---------
 - Audio
 - Chrome OS verified boot
-- Support for CONFIG_EFI_LOADER
 - Building U-Boot to run in 64-bit mode
 
 References