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x86: use gc sections to reduce image size

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Follow the discussion of Charles Manning and Mike Frysinger.
Using gc_sections helps reduce image size.
This commit is contained in:
Graeme Russ 2010-10-07 20:03:20 +11:00
parent abe98f49e1
commit d664adb6bb
2 changed files with 8 additions and 5 deletions
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3
arch/i386/config.mk
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@ -26,3 +26,6 @@ CROSS_COMPILE ?= i386-linux-
STANDALONE_LOAD_ADDR = 0x40000
PLATFORM_CPPFLAGS += -DCONFIG_I386 -D__I386__
LDFLAGS += --cref --gc-sections
PLATFORM_RELFLAGS += -ffunction-sections

10
board/eNET/u-boot.lds
View file

@ -77,13 +77,13 @@ SECTIONS
_i386boot_bss_size = SIZEOF(.bss);
/* 16bit realmode trampoline code */
.realmode 0x7c0 : AT ( LOADADDR(.rel.dyn) + SIZEOF(.rel.dyn) ) { *(.realmode) }
.realmode 0x7c0 : AT ( LOADADDR(.rel.dyn) + SIZEOF(.rel.dyn) ) { KEEP(*(.realmode)) }
_i386boot_realmode = LOADADDR(.realmode);
_i386boot_realmode_size = SIZEOF(.realmode);
/* 16bit BIOS emulation code (just enough to boot Linux) */
.bios 0 : AT ( LOADADDR(.realmode) + SIZEOF(.realmode) ) { *(.bios) }
.bios 0 : AT ( LOADADDR(.realmode) + SIZEOF(.realmode) ) { KEEP(*(.bios)) }
_i386boot_bios = LOADADDR(.bios);
_i386boot_bios_size = SIZEOF(.bios);
@ -98,12 +98,12 @@ SECTIONS
* The fff0 offset of resetvec is important, however.
*/
. = 0xfffffe00;
.start32 : AT (TEXT_BASE + 0x3fe00) { *(.start32); }
.start32 : AT (TEXT_BASE + 0x3fe00) { KEEP(*(.start32)); }
. = 0xf800;
.start16 : AT (TEXT_BASE + 0x3f800) { *(.start16); }
.start16 : AT (TEXT_BASE + 0x3f800) { KEEP(*(.start16)); }
. = 0xfff0;
.resetvec : AT (TEXT_BASE + 0x3fff0) { *(.resetvec); }
.resetvec : AT (TEXT_BASE + 0x3fff0) { KEEP(*(.resetvec)); }
_i386boot_end = (LOADADDR(.resetvec) + SIZEOF(.resetvec) );
}