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fixed a few MMU quirks

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This commit is contained in:
Markus Fröschle
2014-09-17 05:28:16 +00:00
parent 01141f4251
commit 02ab73f2cc
6 changed files with 316 additions and 308 deletions
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4
sys/mmu.c
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@@ -62,7 +62,7 @@
#error "unknown machine!"
#endif /* MACHINE_FIREBEE */
#define DEBUG_MMU
// #define DEBUG_MMU
#ifdef DEBUG_MMU
#define dbg(format, arg...) do { xprintf("DEBUG (%s()): " format, __FUNCTION__, ##arg);} while(0)
#else
@@ -377,7 +377,7 @@ void mmu_init(void)
* Map (locked) the second last MB of physical SDRAM (this is where BaS .data and .bss reside) to the same
* virtual address. This is also used (completely) when BaS is in RAM
*/
flags.cache_mode = CACHE_WRITETHROUGH;
flags.cache_mode = CACHE_COPYBACK;
flags.access = ACCESS_READ | ACCESS_WRITE | ACCESS_EXECUTE;
mmu_map_page(SDRAM_START + SDRAM_SIZE - 0X00200000, SDRAM_START + SDRAM_SIZE - 0X00200000, MMU_PAGE_SIZE_1M, &flags);