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[ar71xx] rewrite memory size detection
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13198 3c298f89-4303-0410-b956-a3cf2f4a3e73
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@ -85,28 +85,14 @@ int __init ar71xx_pci_init(unsigned nr_irqs, struct ar71xx_pci_irq *map)
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static void __init ar71xx_detect_mem_size(void)
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{
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volatile u8 *p;
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u8 memsave;
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u32 size;
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unsigned long size;
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p = (volatile u8 *) KSEG1ADDR(0);
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memsave = *p;
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for (size = AR71XX_MEM_SIZE_MIN;
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size <= (AR71XX_MEM_SIZE_MAX >> 1); size <<= 1) {
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volatile u8 *r;
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r = (p + size);
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*p = 0x55;
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if (*r == 0x55) {
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/* Mirrored data found, try another pattern */
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*p = 0xAA;
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if (*r == 0xAA) {
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/* Mirrored data found again, stop detection */
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for (size = AR71XX_MEM_SIZE_MIN; size < AR71XX_MEM_SIZE_MAX;
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size <<= 1 ) {
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if (!memcmp(ar71xx_detect_mem_size,
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ar71xx_detect_mem_size + size, 1024))
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break;
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}
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}
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}
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*p = memsave;
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add_memory_region(0, size, BOOT_MEM_RAM);
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}
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