Merge branch 'master' of git://git.denx.de/u-boot-sh

[oweals/u-boot.git] / doc / README.x86

diff --git a/doc/README.x86 b/doc/README.x86
index 22bfbabe0227ae57a8ac968d38a1294e829d44fa..8e0a3f36edfe29e8e956455a5b015b55db9a7242 100644 (file)
--- a/doc/README.x86
+++ b/doc/README.x86
@@ -185,6 +185,22 @@ If you are using em100, then this command will flash write -Boot:
 
    em100 -s -d filename.rom -c W25Q64CV -r
 
+Flash map for samus / broadwell:
+
+   fffff800    SYS_X86_START16
+   ffff0000    RESET_SEG_START
+   fffd8000    TPL_TEXT_BASE
+   fffa0000    X86_MRC_ADDR
+   fff90000    VGA_BIOS_ADDR
+   ffed0000    SYS_TEXT_BASE
+   ffea0000    X86_REFCODE_ADDR
+   ffe70000    SPL_TEXT_BASE
+   ffbf8000    CONFIG_ENV_OFFSET (environemnt offset)
+   ffbe0000    rw-mrc-cache (Memory-reference-code cache)
+   ffa00000    <spare>
+   ff801000    intel-me (address set by descriptor.bin)
+   ff800000    intel-descriptor
+
 ---
 
 Intel Crown Bay specific instructions for bare mode:
@@ -1160,27 +1176,10 @@ to load a 'u-boot-payload.efi', see below test logs on QEMU.
 
 See README.u-boot_on_efi and README.uefi for details of EFI support in U-Boot.
 
-64-bit Support
---------------
-U-Boot supports booting a 64-bit kernel directly and is able to change to
-64-bit mode to do so. However, U-Boot itself is currently always built
-in 32-bit mode. Some access to the full memory range is provided with
-arch_phys_memset().
-
-The development work to make U-Boot itself run in 64-bit mode has not yet
-been attempted. The best approach would likely be to build a 32-bit SPL
-image for U-Boot, with CONFIG_SPL_BUILD. This could then handle the early CPU
-init in 16-bit and 32-bit mode, running the FSP and any other binaries that
-are needed. Then it could change to 64-bit model and jump to U-Boot proper.
-
-Given U-Boot's extensive 64-bit support this has not been a high priority,
-but it would be a nice addition.
-
 TODO List
 ---------
 - Audio
 - Chrome OS verified boot
-- Building U-Boot to run in 64-bit mode
 
 References
 ----------