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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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17
bas.lk.in
View File

@@ -19,7 +19,8 @@ MEMORY
/*
* target to copy BaS data segment to. 1M should be enough for now
*/
bas_ram (WX) : ORIGIN = SDRAM_START + SDRAM_SIZE - 0x00100000, LENGTH = 0x00100000
bas_ram (WX) : ORIGIN = SDRAM_START + SDRAM_SIZE - 0x00200000, LENGTH = 0x00100000
driver_ram (WX) : ORIGIN = SDRAM_START + SDRAM_SIZE - 0x00100000, LENGTH = 0x00100000
}
SECTIONS
@@ -78,15 +79,11 @@ SECTIONS
*(.bss)
__BAS_BSS_END = .;
#endif /* COMPILE_RAM */
#if (FORMAT == elf32-m68k)
*(.rodata)
*(.rodata.*)
#endif
#ifdef COMPILE_RAM
. = ALIGN(16);
_driver_mem_buffer = .;
// . = . + DRIVER_MEM_BUFFER_SIZE
#endif /* COMPILE_RAM */
} > bas_rom
#if (TARGET_ADDRESS == BOOTFLASH_BASE_ADDRESS)
@@ -108,11 +105,15 @@ SECTIONS
__BAS_BSS_END = .;
. = ALIGN(16);
_driver_mem_buffer = .;
//. = . + DRIVER_MEM_BUFFER_SIZE;
} > bas_ram
#endif
.driver_memory :
{
_driver_mem_buffer = .;
//. = . + DRIVER_MEM_BUFFER_SIZE;
} > driver_ram
/*
* Global memory map
*/

2
include/firebee.h
View File

@@ -37,7 +37,7 @@
#define SDRAM_SIZE 0x20000000 /* 512 MB on the Firebee */
#ifdef COMPILE_RAM
#define TARGET_ADDRESS (SDRAM_START + SDRAM_SIZE - 0x100000)
#define TARGET_ADDRESS (SDRAM_START + SDRAM_SIZE - 0x200000)
#else
#define TARGET_ADDRESS BOOTFLASH_BASE_ADDRESS

2
include/m5484l.h
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@@ -37,7 +37,7 @@
#define SDRAM_SIZE 0x4000000 /* 64 MB on the LITEKIT */
#ifdef COMPILE_RAM
#define TARGET_ADDRESS (SDRAM_START + SDRAM_SIZE - 0x100000)
#define TARGET_ADDRESS (SDRAM_START + SDRAM_SIZE - 0x200000)
#else
#define TARGET_ADDRESS BOOTFLASH_BASE_ADDRESS
#endif /* COMPILE_RAM */

28
sys/mmu.c
View File

@@ -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 */