devs/foxbox
1
0
Fork 0
forked from len0rd/rockbox
Code Pull requests Activity

Set up the Flash, LCD and ATA chip selects

Browse source 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5220 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Linus Nielsen Feltzing 2004-10-08 08:04:11 +00:00
parent 3796a58cea
commit 0d472c457b
1 changed files with 46 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

50
firmware/crt0.S
View file

@ -31,14 +31,56 @@ start:
move.l #MBAR2+1,%d0
movec.l %d0,%mbar2
lea MBAR,%a0
lea MBAR2,%a1
/* 64K DMA-capable SRAM at 0x10000000
DMA is enabled and has priority in both banks
All types of accesses are allowed
(We might want to restrict that to save power) */
move.l #0x1000e001,%d0
movec.l %d0,%rambar1
/* 32K Non-DMA SRAM at 0x10010000
All types of accesses are allowed
(We might want to restrict that to save power) */
move.l #0x10010001,%d0
movec.l %d0,%rambar0
/* Chip select 0 - Flash ROM */
move.l #0x00000000,%d0 /* CSAR0 - Base = 0x00000000 */
move.l %d0,(0x080,%a0)
move.l #0x001f0101,%d0 /* CSMR0 - 2M, All access, write protect */
move.l %d0,(0x084,%a0)
move.l #0x00000d80,%d0 /* CSCR0 - 3 wait states, 16 bits, no bursts */
move.l %d0,(0x088,%a0)
/* Chip select 1 - LCD controller */
move.l #0xf0000000,%d0 /* CSAR1 - Base = 0xf0000000 */
move.l %d0,(0x08c,%a0)
move.l #0x0000007b,%d0 /* CSMR1 - 64K, Only data access */
move.l %d0,(0x090,%a0)
move.l #0x00002180,%d0 /* CSCR1 - 8 wait states, 16 bits, no bursts */
move.l %d0,(0x094,%a0)
/* Chip select 2 - ATA controller */
move.l #0x20000000,%d0 /* CSAR2 - Base = 0x20000000 */
move.l %d0,(0x098,%a0)
move.l #0x0000007b,%d0 /* CSMR2 - 64K, Only data access */
move.l %d0,(0x09c,%a0)
move.l #0x00000180,%d0 /* CSCR2 - no wait states, 16 bits, no bursts */
move.l %d0,(0x0a0,%a0) /* NOTE: I'm not sure about the wait states.
We have to be careful with the access times,
since IORDY isn't connected to the HDD. */
/* Test code: blink the backlight */
lea MBAR2,%a0
move.l #0x00020000,%d0
move.l %d0,(0xbc,%a0) /* Function = 1 */
move.l %d0,(0xb8,%a0) /* Enable = 1 */
move.l %d0,(0xbc,%a1) /* Function = 1 */
move.l %d0,(0xb8,%a1) /* Enable = 1 */
.blinkloop:
eor.l %d0,(0xb4,%a0)
eor.l %d0,(0xb4,%a1)
move.l #2000000,%d2
.delay: