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@ -21,25 +21,32 @@ void __init |
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prom_init(int argc, const char **argv) |
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prom_init(int argc, const char **argv) |
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{ |
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{ |
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unsigned long mem; |
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unsigned long mem; |
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unsigned long max; |
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mips_machgroup = MACH_GROUP_BRCM; |
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mips_machgroup = MACH_GROUP_BRCM; |
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mips_machtype = MACH_BCM947XX; |
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mips_machtype = MACH_BCM947XX; |
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/* Figure out memory size by finding aliases */ |
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/* Figure out memory size by finding aliases
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*
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* BCM47XX uses 128MB for addressing the ram, if the system contains |
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* less that that amount of ram it remaps the ram more often into the |
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* available space. |
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* Accessing memory after 128MB will cause an exception. |
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* max contains the biggest possible address supported by the platform. |
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* If the method wants to try something above we assume 128MB ram. |
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*/ |
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max = ((unsigned long)(prom_init) | ((128 << 20) - 1)); |
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for (mem = (1 << 20); mem < (128 << 20); mem += (1 << 20)) { |
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for (mem = (1 << 20); mem < (128 << 20); mem += (1 << 20)) { |
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if (((unsigned long)(prom_init) + mem) > max) { |
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mem = (128 << 20); |
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printk("assume 128MB RAM\n"); |
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break; |
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} |
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if (*(unsigned long *)((unsigned long)(prom_init) + mem) ==
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if (*(unsigned long *)((unsigned long)(prom_init) + mem) ==
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*(unsigned long *)(prom_init)) |
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*(unsigned long *)(prom_init)) |
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break; |
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break; |
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} |
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} |
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/* Ignoring the last page when ddr size is 128M. Cached
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* accesses to last page is causing the processor to prefetch |
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* using address above 128M stepping out of the ddr address |
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* space. |
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*/ |
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if (mem == 0x8000000) |
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mem -= 0x1000; |
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add_memory_region(0, mem, BOOT_MEM_RAM); |
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add_memory_region(0, mem, BOOT_MEM_RAM); |
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} |
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} |
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