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h.修改arch/arm/kernel/debug-armv.S文件，在适当的位置增加如下关于S3C2410的代码：
#elif defined(CONFIG_ARCH_S3C2410)
.macro addruart,rx
mrc p15, 0, \rx, c1, c0
tst \rx, #1 @ MMU enabled ?
moveq \rx, #0x50000000 @ physical base address
movne \rx, #0xf0000000 @ virtual address
.endm
.macro senduart,rd,rx
str \rd, [\rx, #0x20] @ UTXH
.endm
.macro waituart,rd,rx
.endm
.macro busyuart,rd,rx
1001: ldr \rd, [\rx, #0x10] @ read UTRSTAT
tst \rd, #1 << 2 @ TX_EMPTY ?
beq 1001b
.endm |
i.修改arch/arm/kernel/setup.c文件
此文件中的setup_arch非常关键，用来完成与体系结构相关的初始化：
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void __init setup_arch(char **cmdline_p)
{
struct tag *tags = NULL;
struct machine_desc *mdesc;
char *from = default_command_line;
ROOT_DEV = MKDEV(0, 255);
setup_processor();
mdesc = setup_machine(machine_arch_type);
machine_name = mdesc->name;
if (mdesc->soft_reboot)
reboot_setup("s");
if (mdesc->param_offset)
tags = phys_to_virt(mdesc->param_offset);
/*
* Do the machine-specific fixups before we parse the
* parameters or tags.
*/
if (mdesc->fixup)
mdesc->fixup(mdesc, (struct param_struct *)tags,
&from, &meminfo);
/*
* If we have the old style parameters, convert them to
* a tag list before.
*/
if (tags && tags->hdr.tag != ATAG_CORE)
convert_to_tag_list((struct param_struct *)tags,
meminfo.nr_banks == 0);
if (tags && tags->hdr.tag == ATAG_CORE)
parse_tags(tags);
if (meminfo.nr_banks == 0) {
meminfo.nr_banks = 1;
meminfo.bank[0].start = PHYS_OFFSET;
meminfo.bank[0].size = MEM_SIZE;
}
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