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rk27xx: Add failsafe mode to the bootloader

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Change-Id: Iba8fdc50b3c71831a6f55d15779fee8d1f12cb4f
This commit is contained in:
Marcin Bukat 2012-04-27 16:19:31 +02:00
parent 2bafdae6b1
commit 79a667d3e2
1 changed files with 80 additions and 2 deletions
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78
bootloader/rk27xx.c
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@ -19,11 +19,59 @@
#include "crc32-rkw.h"
#include "rkw-loader.h"
/* beginning of DRAM */
#define DRAM_ORIG 0x60000000
/* bootloader code runs from 0x60700000
* so we cannot load more code to not overwrite ourself
*/
#define LOAD_SIZE 0x700000
extern void show_logo( void );
/* This function setup bare minimum
* and jumps to rom in order to activate
* hardcoded rkusb mode
*/
static void enter_rkusb(void)
{
asm volatile (
/* turn off cache */
"ldr r0, =0xefff0000 \n"
"ldrh r1, [r0] \n"
"strh r1, [r0] \n"
/* turn off interrupts */
"mrs r0, cpsr \n"
"bic r0, r0, #0x1f \n"
"orr r0, r0, #0xd3 \n"
"msr cpsr, r0 \n"
/* disable iram remap */
"mov r0, #0x18000000 \n"
"add r0, r0, #0x1c000 \n"
"mov r1, #0 \n"
"str r1, [r0, #4] \n"
/* setup stacks in unmapped
* iram just as rom will do
*/
"msr cpsr, #0xd2 \n"
"ldr r1, =0x18200274 \n"
"add r1, r1, #0x200 \n"
"mov sp, r1 \n"
"msr cpsr, #0xd3 \n"
"add r1, r1, #0x400 \n"
"mov sp, r1 \n"
/* jump to main() in rom
* just before dfu handler
*/
"ldr r0, =0xec0 \n"
"bx r0 \n"
);
}
void main(void) NORETURN_ATTR;
void main(void)
{
@ -87,23 +135,53 @@ void main(void)
printf(rkw_strerror(ret));
lcd_update();
sleep(5*HZ);
/* if we boot rockbox we shutdown on error
* if we boot OF we fall back to rkusb mode on error
*/
if (boot == rb)
{
power_off();
}
else
{
/* give visual feedback what we are doing */
printf("Entering rockchip USB mode...");
lcd_update();
enter_rkusb();
}
}
else
{
/* print 'Loading OK' */
printf(rkw_strerror(0));
sleep(HZ);
}
/* jump to entrypoint */
kernel_entry = (void*) loadbuffer;
commit_discard_idcache();
printf("Executing");
kernel_entry();
/* this should never be reached actually */
printf("ERR: Failed to boot");
sleep(5*HZ);
if (boot == rb)
{
power_off();
}
else
{
/* give visual feedback what we are doing */
printf("Entering rockchip USB mode...");
lcd_update();
enter_rkusb();
}
/* hang */
while(1);