Firebee/BaS_gcc
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added a 1 Meg page as very last RAM page to handle uncached memory for drivers. This moved the BaS RAM area to the second last page of memory

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This commit is contained in:
Markus Fröschle
2013-12-22 16:08:18 +00:00
parent 4c15edaab2
commit ff403fc7a3
4 changed files with 36 additions and 13 deletions
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28
sys/mmu.c
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@@ -313,7 +313,7 @@ void __attribute__((flatten)) mmu_init(void)
MCF_MMU_MMUDR_SZ(0) | /* 1 MB page size */
MCF_MMU_MMUDR_CM(0x1) | /* cachable copyback */
MCF_MMU_MMUDR_R | /* read access enable */
MCF_MMU_MMUDR_W | /* write access enable (FIXME: for now) */
//MCF_MMU_MMUDR_W | /* write access enable (FIXME: for now) */
MCF_MMU_MMUDR_X | /* execute access enable */
MCF_MMU_MMUDR_LK; /* lock entry */
MCF_MMU_MMUOR = MCF_MMU_MMUOR_ACC | /* access TLB, data */
@@ -347,16 +347,38 @@ void __attribute__((flatten)) mmu_init(void)
#endif /* MACHINE_FIREBEE */
/*
* Map (locked) the last MB of physical SDRAM (this is where BaS .data and .bss reside) to the same
* 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 when BaS is in RAM
*/
MCF_MMU_MMUTR = (SDRAM_START + SDRAM_SIZE - 0x00200000) | /* virtual address */
MCF_MMU_MMUTR_SG | /* shared global */
MCF_MMU_MMUTR_V; /* valid */
MCF_MMU_MMUDR = (SDRAM_START + SDRAM_SIZE - 0x00200000) | /* physical address */
MCF_MMU_MMUDR_SZ(0) | /* 1 MB page size */
MCF_MMU_MMUDR_CM(0x0) | /* cacheable writethrough */
MCF_MMU_MMUDR_SP | /* supervisor protect */
MCF_MMU_MMUDR_R | /* read access enable */
MCF_MMU_MMUDR_W | /* write access enable */
MCF_MMU_MMUDR_X | /* execute access enable */
MCF_MMU_MMUDR_LK; /* lock entry */
MCF_MMU_MMUOR = MCF_MMU_MMUOR_ACC | /* access TLB, data */
MCF_MMU_MMUOR_UAA; /* update allocation address field */
MCF_MMU_MMUOR = MCF_MMU_MMUOR_ITLB | /* instruction */
MCF_MMU_MMUOR_ACC | /* access TLB */
MCF_MMU_MMUOR_UAA; /* update allocation address field */
/*
* Map (locked) the very last MB of physical SDRAM (this is where the driver buffers reside) to the same
* virtual address. Used uncached for drivers.
*/
MCF_MMU_MMUTR = (SDRAM_START + SDRAM_SIZE - 0x00100000) | /* virtual address */
MCF_MMU_MMUTR_SG | /* shared global */
MCF_MMU_MMUTR_V; /* valid */
MCF_MMU_MMUDR = (SDRAM_START + SDRAM_SIZE - 0x00100000) | /* physical address */
MCF_MMU_MMUDR_SZ(0) | /* 1 MB page size */
MCF_MMU_MMUDR_CM(0x0) | /* cacheable writethrough */
MCF_MMU_MMUDR_CM(0x2) | /* nocache precise */
MCF_MMU_MMUDR_SP | /* supervisor protect */
MCF_MMU_MMUDR_R | /* read access enable */
MCF_MMU_MMUDR_W | /* write access enable */