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csky: Support dynamic start physical address

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Before this patch csky-linux need CONFIG_RAM_BASE to determine start
physical address. Now we use phys_offset variable to replace the macro
of PHYS_OFFSET and we setup phys_offset with real physical address which
is determined during startup in head.S.

With this patch we needn't re-compile kernel for different start
physical address. ie: 0x0 / 0xc0000000 start physical address could use
the same vmlinux, be care different start address must be 512MB aligned.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Guo Ren
2019-04-08 11:12:25 +08:00
parent bf24168293
commit f62e31623d
8 changed files with 106 additions and 31 deletions
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5
arch/csky/kernel/setup.c
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@@ -142,11 +142,16 @@ void __init setup_arch(char **cmdline_p)
#endif
}
unsigned long phys_offset;
EXPORT_SYMBOL(phys_offset);
asmlinkage __visible void __init csky_start(unsigned int unused, void *param)
{
/* Clean up bss section */
memset(__bss_start, 0, __bss_stop - __bss_start);
phys_offset = read_mmu_msa0() & ~(SSEG_SIZE - 1);
pre_trap_init();
pre_mmu_init();