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[romprefix] Remove .hrom prefix

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The .hrom prefix provides an experimental mechanism for reducing
option ROM space usage on systems where PMM allocation fails, by
pretending that PMM allocation succeeded and gave us an address fixed
at compilation time.  This is unreliable, and potentially dangerous.
In particular, when multiple gPXE ROMs are present in a system, each
gPXE ROM will assume ownership of the same fixed address, resulting in
undefined behaviour.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2010-04-19 20:38:35 +01:00
parent 329686c026
commit 8ffea19225
4 changed files with 0 additions and 28 deletions
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13
src/arch/i386/prefix/romprefix.S
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@@ -352,7 +352,6 @@ got_pmm: /* PMM allocation succeeded */
call print_character
movw %si, %ax
call print_hex_byte
pmm_copy:
/* Copy ROM to PMM block */
xorw %ax, %ax
movw %ax, %es
@@ -364,19 +363,7 @@ pmm_copy:
movl %edi, decompress_to
/* Shrink ROM */
movb $_prefix_memsz_sect, romheader_size
#ifdef SHRINK_WITHOUT_PMM
jmp pmm_done
pmm_fail:
/* Print marker and copy ourselves to high memory */
movl $HIGHMEM_LOADPOINT, image_source
xorw %di, %di
movb $( '!' ), %al
call print_character
jmp pmm_copy
pmm_done:
#else
pmm_fail:
#endif
/* Restore upper register halves */
popal
no_pmm: