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[ar71xx] rewrite memory size detection

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13198 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
juhosg 2008-11-13 15:55:39 +00:00
parent 6974a2421e
commit 7bb460e11a
1 changed files with 6 additions and 20 deletions
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26
target/linux/ar71xx/files/arch/mips/ar71xx/setup.c
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@ -85,28 +85,14 @@ int __init ar71xx_pci_init(unsigned nr_irqs, struct ar71xx_pci_irq *map)
static void __init ar71xx_detect_mem_size(void)
{
volatile u8 *p;
u8 memsave;
u32 size;
unsigned long size;
p = (volatile u8 *) KSEG1ADDR(0);
memsave = *p;
for (size = AR71XX_MEM_SIZE_MIN;
size <= (AR71XX_MEM_SIZE_MAX >> 1); size <<= 1) {
volatile u8 *r;
r = (p + size);
*p = 0x55;
if (*r == 0x55) {
/* Mirrored data found, try another pattern */
*p = 0xAA;
if (*r == 0xAA) {
/* Mirrored data found again, stop detection */
break;
}
}
for (size = AR71XX_MEM_SIZE_MIN; size < AR71XX_MEM_SIZE_MAX;
size <<= 1 ) {
if (!memcmp(ar71xx_detect_mem_size,
ar71xx_detect_mem_size + size, 1024))
break;
}
*p = memsave;
add_memory_region(0, size, BOOT_MEM_RAM);
}