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| author | Graeme Russ <graeme.russ@gmail.com> | 2010-04-24 00:05:42 +1000 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2010-05-06 00:15:31 +0200 |
| commit | 077e1958ca4afe12d88043b123ded058c51b89f7 (patch) | |
| tree | da450fd1e80c401a87d3de1d3a8fe21075e851f3 /board | |
| parent | 759598f82f02cc84614450807cb5de43ca18a339 (diff) | |
| download | u-boot-imx-077e1958ca4afe12d88043b123ded058c51b89f7.zip u-boot-imx-077e1958ca4afe12d88043b123ded058c51b89f7.tar.gz u-boot-imx-077e1958ca4afe12d88043b123ded058c51b89f7.tar.bz2 | |
x86: Add RAM bootstrap functionality
Add a parameter to the 32-bit entry to indicate if entry is from Real
Mode or not. If entry is from Real Mode, execute the destructive 'sizer'
routine to determine memory size as we are booting cold and running in
Flash. If not entering from Real Mode, we are executing a U-Boot image
from RAM and therefore the memory size is already known (and running
'sizer' will destroy the running image)
There are now two 32-bit entry points. The first is the 'in RAM' entry
point which exists at the start of the U-Boot binary image. As such,
you can load u-boot.bin in RAM and jump directly to the load address
without needing to calculate any offsets. The second entry point is
used by the real-to-protected mode switch
This patch also changes TEXT_BASE to 0x6000000 (in RAM). You can load
the resulting image at 0x6000000 and simple go 0x6000000 from the u-boot
prompt
Hopefully a later patch will completely elliminate any dependency on
TEXT_BASE like a relocatable linux kernel (perfect world)
Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
Diffstat (limited to 'board')
| -rw-r--r-- | board/eNET/config.mk | 2 | ||||
| -rw-r--r-- | board/eNET/u-boot.lds | 9 |
2 files changed, 5 insertions, 6 deletions
diff --git a/board/eNET/config.mk b/board/eNET/config.mk index dcde7fc..63a58fd 100644 --- a/board/eNET/config.mk +++ b/board/eNET/config.mk @@ -21,7 +21,7 @@ # MA 02111-1307 USA # -TEXT_BASE = 0x38040000 +TEXT_BASE = 0x06000000 CFLAGS_common/dlmalloc.o += -Wa,--no-warn -fno-strict-aliasing PLATFORM_RELFLAGS += -fvisibility=hidden PLATFORM_CPPFLAGS += -fno-dwarf2-cfi-asm diff --git a/board/eNET/u-boot.lds b/board/eNET/u-boot.lds index 0d74021..7b0ffaa 100644 --- a/board/eNET/u-boot.lds +++ b/board/eNET/u-boot.lds @@ -27,7 +27,7 @@ ENTRY(_start) SECTIONS { - . = 0x38040000; /* Location of bootcode in flash */ + . = 0x06000000; /* Location of bootcode in flash */ _i386boot_text_start = .; .text : { *(.text); } @@ -97,14 +97,13 @@ SECTIONS * at reset and the code have to fit. * The fff0 offset of resetvec is important, however. */ - . = 0xfffffe00; - .start32 : AT (0x3807fe00) { *(.start32); } + .start32 : AT (0x0603fe00) { *(.start32); } . = 0xf800; - .start16 : AT (0x3807f800) { *(.start16); } + .start16 : AT (0x0603f800) { *(.start16); } . = 0xfff0; - .resetvec : AT (0x3807fff0) { *(.resetvec); } + .resetvec : AT (0x0603fff0) { *(.resetvec); } _i386boot_end = (LOADADDR(.resetvec) + SIZEOF(.resetvec) ); } |