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arm, arm926ejs: make thumb mode compileable

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in thumb mode compiler says for example for arch/arm/lib/cache-cp15.c
when enabling CONFIG_SYS_THUMB_BUILD:

{standard input}: Assembler messages:
{standard input}:373: Error: selected processor does not support Thumb mode `mrc p15,0,r4,c1,c0,0'
{standard input}:416: Error: selected processor does not support Thumb mode `mcr p15,0,r3,c2,c0,0'

so, if caches are disabled, do not use this command on arm926ejs.
used on at91 in SPL, to reduce size of SPL.

Signed-off-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Heiko Schocher 2014-11-18 09:41:56 +01:00 committed by Andreas Bießmann
parent ab77f24119
commit 99197a9e31
2 changed files with 4 additions and 0 deletions
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2
arch/arm/cpu/arm926ejs/cpu.c
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@ -45,7 +45,9 @@ int cleanup_before_linux (void)
/* flush I/D-cache */
static void cache_flush (void)
{
#if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
unsigned long i = 0;
asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));
#endif
}

2
arch/arm/lib/cache.c
View file

@ -25,10 +25,12 @@ __weak void flush_cache(unsigned long start, unsigned long size)
#endif /* CONFIG_CPU_ARM1136 */
#ifdef CONFIG_CPU_ARM926EJS
#if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
/* test and clean, page 2-23 of arm926ejs manual */
asm("0: mrc p15, 0, r15, c7, c10, 3\n\t" "bne 0b\n" : : : "memory");
/* disable write buffer as well (page 2-22) */
asm("mcr p15, 0, %0, c7, c10, 4" : : "r" (0));
#endif
#endif /* CONFIG_CPU_ARM926EJS */
return;
}