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x86: Factor out common values in the link script

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Define the reset base in config.mk so that it does not need to be calculated
twice in the link script. Also tidy up the START_16 and RESET_VEC_LOC values
to fit with this new approach.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2014-11-14 18:18:25 -07:00
parent 091c494353
commit a6a957849a
2 changed files with 12 additions and 7 deletions
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5
arch/x86/cpu/config.mk
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@ -12,5 +12,6 @@ PLATFORM_CPPFLAGS += -D__I386__ -Werror
# DO NOT MODIFY THE FOLLOWING UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!
LDPPFLAGS += -DRESET_SEG_START=0xffff0000
LDPPFLAGS += -DRESET_SEG_SIZE=0x10000
LDPPFLAGS += -DRESET_VEC_LOC=0xfff0
LDPPFLAGS += -DSTART_16=0xf800
LDPPFLAGS += -DRESET_VEC_LOC=0xfffffff0
LDPPFLAGS += -DSTART_16=$(CONFIG_SYS_X86_START16)
LDPPFLAGS += -DRESET_BASE="CONFIG_SYS_TEXT_BASE + (CONFIG_SYS_MONITOR_LEN - RESET_SEG_SIZE)"

14
arch/x86/cpu/u-boot.lds
View file

@ -66,15 +66,19 @@ SECTIONS
/DISCARD/ : { *(.gnu*) }
#ifdef CONFIG_X86_RESET_VECTOR
/*
* The following expressions place the 16-bit Real-Mode code and
* Reset Vector at the end of the Flash ROM
*/
. = START_16;
.start16 : AT (CONFIG_SYS_TEXT_BASE + (CONFIG_SYS_MONITOR_LEN - RESET_SEG_SIZE + START_16)) { KEEP(*(.start16)); }
. = START_16 - RESET_SEG_START;
.start16 : AT (START_16) {
KEEP(*(.start16));
}
. = RESET_VEC_LOC;
.resetvec : AT (CONFIG_SYS_TEXT_BASE + (CONFIG_SYS_MONITOR_LEN - RESET_SEG_SIZE + RESET_VEC_LOC)) { KEEP(*(.resetvec)); }
. = RESET_VEC_LOC - RESET_SEG_START;
.resetvec : AT (RESET_VEC_LOC) {
KEEP(*(.resetvec));
}
#endif
}