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fix __MBAR and __RAMBAR for MCF54455

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This commit is contained in:
Markus Fröschle
2015-11-20 12:34:17 +00:00
parent 64e994e440
commit 7fcb150791
2 changed files with 23 additions and 4 deletions
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16
sys/startcf.S
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@@ -18,20 +18,22 @@ _rom_header:
* We replace it by bra.s to allow running the ROM from the first byte.
* Then we add a fake jmp instruction for pretty disassembly.
*/
bra.s _rom_entry // Short jump to the real entry point
.short 0x4ef9 // Fake jmp instruction
bra.s _rom_entry // Short jump to the real entry point
.short 0x4ef9 // Fake jmp instruction
/* The second long is the initial PC */
.long _rom_entry // Real entry point
.long _rom_entry // Real entry point
/* ROM entry point */
_rom_entry:
/* disable interrupts */
move.w #0x2700,sr
#if !defined(MACHINE_M54455) // MCF54455 does not have the MBAR register
/* Initialize MBAR */
move.l #__MBAR,d0
movec d0,MBAR
move.l d0,_rt_mbar
#endif
/* mmu off */
move.l #__MMUBAR+1,d0
@@ -40,11 +42,17 @@ _rom_entry:
clr.l d0
move.l d0,MCF_MMU_MMUCR
#if !defined(MACHINE_M54455) // MCF54455 does not have RAMBAR0 and RAMBAR1 registers */
/* Initialize RAMBARs: locate SRAM and validate it */
move.l #__RAMBAR0 + 0x7,d0 /* supervisor only */
move.l #__RAMBAR0 + 0x7,d0 // supervisor only
movec d0,RAMBAR0
move.l #__RAMBAR1 + 0x1,d0
movec d0,RAMBAR1
#else
move.l #__RAMBAR0 + 0x7,d0
movec d0,RAMBAR
#endif
/* set stack pointer to end of SRAM */
lea __SUP_SP,a7