Add multiboot support.
I've been successfully using SeaBIOS as secondary bootloader. In more details
I have GRUB2-as-payload in flash together with coreboot. SeaBIOS binary is on
the HDD and loaded by GRUB when needed. This has an unfortunate consequence
that I have to keep vga oprom in flash even if usually I boot without it. This
patches makes bios.bin.elf multiboot executable with files passed as modules.
Example:
menuentry "SeaBIOS (mb)" --unrestricted {
root=ahci0,2
multiboot /bios.bin.elf
module /vgabios_x230.rom name=pci8086,0166.rom
}
the parameter name= specifies under which name SeaBIOS will see it.
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
diff --git a/scripts/layoutrom.py b/scripts/layoutrom.py
index dd770fe..b976fb0 100755
--- a/scripts/layoutrom.py
+++ b/scripts/layoutrom.py
@@ -161,6 +161,7 @@
# The sections (and associated information) to be placed in output rom
class LayoutInfo:
sections = None
+ config = None
genreloc = None
sec32init_start = sec32init_end = sec32init_align = None
sec32low_start = sec32low_end = None
@@ -172,6 +173,7 @@
# Determine final memory addresses for sections
def doLayout(sections, config, genreloc):
li = LayoutInfo()
+ li.config = config
li.sections = sections
li.genreloc = genreloc
# Determine 16bit positions
@@ -399,6 +401,10 @@
filesections32flat = getSectionsFileid(li.sections, '32flat')
out = outXRefs([], exportsyms=li.varlowsyms
, forcedelta=li.final_sec32low_start-li.sec32low_start)
+ multiboot_header = ""
+ if li.config.get('CONFIG_MULTIBOOT'):
+ multiboot_header = "LONG(0x1BADB002) LONG(0) LONG(-0x1BADB002)"
+ sec32all_start -= 3 * 4
out += outXRefs(filesections32flat, exportsyms=[li.entrysym]) + """
_reloc_min_align = 0x%x ;
zonefseg_start = 0x%x ;
@@ -415,6 +421,7 @@
.text code32flat_start : {
%s
%s
+%s
code32flat_end = ABSOLUTE(.) ;
} :text
""" % (li.sec32init_align,
@@ -428,6 +435,7 @@
li.sec32init_start,
li.sec32init_end,
sec32all_start,
+ multiboot_header,
relocstr,
outRelSections(li.sections, 'code32flat_start'))
out = COMMONHEADER + out + COMMONTRAILER + """