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fixed a typo in linker script

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avoid copy of BaS if linked to RAM
This commit is contained in:
Markus Fröschle
2013-08-06 10:39:46 +00:00
parent 080c18f7d8
commit 32920a20c6
4 changed files with 74 additions and 26 deletions
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7
sources/mmu.S
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@@ -78,13 +78,18 @@
.global _mmu_init
.global _mmutr_miss
//
// to avoid chicken and egg situations, we need to make sure that MMU TLB miss exceptions do not end up in a memory
// area that in turn cause a TLB miss exception themself after the MMU is enabled. At least the exception handler must live
// in an area that's either covered by one of the ACR's or a locked MMU TLB entry.
//
.text
_mmu_init:
move.l d3,-(sp) // Backup registers
move.l d2,-(sp)
clr.l d0
movec d0,ASID // ASID allways 0
movec d0,ASID // ASID always 0
move.l d0,_rt_asid // save shadow register
move.l #0xC03FC040,d0 // data r/w precise c000'0000-ffff'ffff

20
sources/sysinit.c
View File

@@ -961,14 +961,22 @@ void initialize_hardware(void) {
//video_1280_1024();
init_ac97();
xprintf("copying BaS (%p - %p) to RAM (%p - %p)\r\n", BAS_LMA, BAS_LMA + BAS_SIZE, BAS_IN_RAM, BAS_IN_RAM + BAS_SIZE);
memcpy((void *) BAS_IN_RAM, BAS_LMA, BAS_SIZE);
xprintf("finished.\r\n");
if (BAS_LMA != BAS_IN_RAM)
{
xprintf("copying BaS (%p - %p) to RAM (%p - %p)\r\n", BAS_LMA, BAS_LMA + BAS_SIZE, BAS_IN_RAM, BAS_IN_RAM + BAS_SIZE);
memcpy((void *) BAS_IN_RAM, BAS_LMA, BAS_SIZE);
xprintf("finished.\r\n");
/* we have copied a code area, so flush the caches */
flush_and_invalidate_caches();
/* we have copied a code area, so flush the caches */
flush_and_invalidate_caches();
/* jump into the BaS in RAM */
}
else
{
xprintf("no BaS copy necessary - running from RAM already\r\n");
}
/* jump into the BaS */
extern void BaS(void);
BaS();
}