Hi, Kevin, I am experimenting with v3 and better integration of SeaBIOS and coreboot. For that, I am copying a SeaBIOS image to the FSEG during coreboot's VGA init code. In addition I added another 32bit entry point to SeaBIOS at 0xffc0 (Thus, living at 0xfffc0)
int copy_systembios(void)
{
struct mem_file archive, result;
int ret;
init_archive(&archive);
ret = find_file(&archive, "bios.bin", &result);
if (ret) {
printk(BIOS_WARNING, "No legacy bios found.\n");
return -1;
}
process_file(&result, (void *)0xf0000);
return 0;
}
void run_bios(struct device *dev, unsigned long addr)
{
int i;
void (*init_systembios)(void) = (void *)0xfffc0;
copy_systembios();
init_systembios();
real_mode_switch_call_vga((dev->bus->secondary << 8) |
dev->path.pci.devfn);
}
Now, the entry point looks like this:
diff -ur -x .git seabios2/src/romlayout.S seabios/src/romlayout.S
--- seabios2/src/romlayout.S 2008-11-06 15:46:44.000000000 +0100
+++ seabios/src/romlayout.S 2008-11-01 11:38:06.000000000 +0100
@@ -544,6 +544,18 @@
ORG 0xff54
IRQ_ENTRY_ARG 05
+.code32
+ ORG 0xffc0 // coreboot Entry Point
+ mov $0x3f8, %dx
+ mov $0x44, %al
+ outb %al, %dx // print
+ call _code32__init
+ mov $0x3f8, %dx
+ mov $0x45, %al
+ outb %al, %dx
+ ret
+.code16gcc
+
ORG 0xfff0 // Power-up Entry Point
ljmpw $SEG_BIOS, $post16
And _init looks like this (simplified):
void VISIBLE32
_init()
{
outb('@', 0x3f8);
}
Unfortunately, this does not seem to work. The machine jumps somewhere
else and will triple fault eventually.
The outb to serial console in the assembler entry point work fine. If I
comment out the call to _code32__init, the function also returns nicely.
(printing "DE" on the way. But as soon as I leave the call in, seabios
crashes after printing "D" It does not even print the @.
Any hints?
Also, find attached a patch to allow cross compilation of SeaBIOS and
make it work with systems where /bin/echo does not know the option -e
Stefan
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Geschäftsführer: Stefan Reinauer • Ust-IdNr.: DE245674866
Fix cross compilation issues of seabios Signed-off-by: Stefan Reinauer <[EMAIL PROTECTED]> diff -ur -x .git seabios/Makefile seabios/Makefile --- seabios/Makefile 2008-10-31 15:46:44.000000000 +0100 +++ seabios/Makefile 2008-10-31 22:50:12.000000000 +0100 @@ -56,7 +56,7 @@ DEPHACK= define whole-compile @echo " Compiling whole program $3" -$(Q)/bin/echo -e '$(foreach i,$2,#include "../$i"\n)' > $3.tmp.c +$(Q)printf '$(foreach i,$2,#include "../$i"\n)' > $3.tmp.c $(Q)$(CC) $1 -c $3.tmp.c -o $3 endef else @@ -93,32 +93,32 @@ $(OUT)rom32.o: $(OUT)romlayout32.o $(OUT)rombios32.lds @echo " Linking (no relocs) $@" - $(Q)ld -r -T $(OUT)rombios32.lds $< -o $@ + $(Q)$(LD) -r -T $(OUT)rombios32.lds $< -o $@ $(OUT)rom16.o: $(OUT)romlayout16.o $(OUT)rom32.o $(OUT)rombios16.lds @echo " Linking $@" - $(Q)objcopy --prefix-symbols=_code32_ $(OUT)rom32.o $(OUT)rom32.rename.o - $(Q)ld -T $(OUT)rombios16.lds -R $(OUT)rom32.rename.o $< -o $@ + $(Q)$(OBJCOPY) --prefix-symbols=_code32_ $(OUT)rom32.o $(OUT)rom32.rename.o + $(Q)$(LD) -T $(OUT)rombios16.lds -R $(OUT)rom32.rename.o $< -o $@ $(OUT)rom.o: $(OUT)rom16.o $(OUT)rom32.o $(OUT)rombios.lds @echo " Linking $@" - $(Q)ld -T $(OUT)rombios.lds $(OUT)rom16.o $(OUT)rom32.o -o $@ + $(Q)$(LD) -T $(OUT)rombios.lds $(OUT)rom16.o $(OUT)rom32.o -o $@ $(OUT)bios.bin.elf: $(OUT)rom.o @echo " Prepping $@" - $(Q)nm $< | ./tools/checkrom.py - $(Q)strip $< -o $@ + $(Q)$(NM) $< | ./tools/checkrom.py + $(Q)$(STRIP) $< -o $@ $(OUT)bios.bin: $(OUT)bios.bin.elf @echo " Extracting binary $@" - $(Q)objcopy -O binary $< $@ + $(Q)$(OBJCOPY) -O binary $< $@ ####### Generic rules clean: - rm -rf $(OUT) + $(Q)rm -rf $(OUT) $(OUT): - mkdir $@ + $(Q)mkdir $@ -include $(OUT)*.d
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