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Nano2G bootloader - fix dual-booting the Apple firmware.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23139 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Dave Chapman 2009-10-12 19:46:45 +00:00
parent 48658eec41
commit a70c7bf862
3 changed files with 15 additions and 11 deletions
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21
bootloader/ipodnano2g.c
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@ -51,8 +51,8 @@
*/
#define MAX_LOADSIZE (8*1024*1024)
/* The buffer to load the firmware into */
unsigned char *loadbuffer = (unsigned char *)0x08000000;
/* The buffer to load the firmware into - use an uncached alias of 0x08000000 */
unsigned char *loadbuffer = (unsigned char *)0x48000000;
/* Bootloader version */
char version[] = APPSVERSION;
@ -229,11 +229,9 @@ void main(void)
if (button_was_held || (btn==BUTTON_MENU)) {
/* If either the hold switch was on, or the Menu button was held, then
try the Apple firmware */
verbose = true;
printf("Loading original firmware...");
if ((rc = readfw("DNANkbso", (void*)0x08000000, &size)) < 0) {
if ((rc = readfw("DNANkbso", loadbuffer, &size)) < 0) {
printf("readfw error %d",rc);
fatal_error();
}
@ -241,7 +239,7 @@ void main(void)
/* Now we need to decrypt it */
printf("Decrypting %d bytes...",size);
aes_decrypt((void*)0x08000000, size);
aes_decrypt(loadbuffer, size);
} else {
printf("Loading Rockbox...");
rc=load_firmware(loadbuffer, BOOTFILE, MAX_LOADSIZE);
@ -265,8 +263,15 @@ void main(void)
/* Remap the bootrom back to zero - that's how the NOR bootloader leaves
it.
*/
// This won't work, as we are running from IRAM mapped to 0x0...
//MIUCON &= ~1;
MIUCON &= ~1;
/* Disable caches and protection unit */
asm volatile(
"mrc 15, 0, r0, c1, c0, 0 \n"
"bic r0, r0, #0x1000 \n"
"bic r0, r0, #0x5 \n"
"mcr 15, 0, r0, c1, c0, 0 \n"
);
/* Branch to start of DRAM */
asm volatile("ldr pc, =0x08000000");