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x86: Provide weak PC/AT compatibility setup function

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It is possibly to setup x86 boards to use non-PC/AT configurations. For
example, the sc520 is an x86 CPU with PC/AT and non-PC/AT peripherals.
This function allows the board to set itself up for maximum PC/AT
compatibility just before booting the Linux kernel (the Linux kernel
'just works' if everything is PC/AT compliant)

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
This commit is contained in:
Graeme Russ 2010-04-24 00:05:48 +10:00 committed by Wolfgang Denk
parent bf16500f79
commit 79ea6b8701
2 changed files with 9 additions and 0 deletions
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2
arch/i386/include/asm/u-boot-i386.h
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@ -43,6 +43,8 @@ int cpu_init_interrupts(void);
int board_init(void);
int dram_init(void);
void setup_pcat_compatibility(void);
void isa_unmap_rom(u32 addr);
u32 isa_map_rom(u32 bus_addr, int size);

7
arch/i386/lib/board.c
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@ -441,3 +441,10 @@ unsigned long do_go_exec (ulong (*entry)(int, char *[]), int argc, char *argv[])
return (entry) (argc, argv);
}
void setup_pcat_compatibility(void)
__attribute__((weak, alias("__setup_pcat_compatibility")));
void __setup_pcat_compatibility(void)
{
}