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#include <stdio.h>
#include <inttypes.h>
#include "config.h"
#include "system.h"
#include "../kernel-internal.h"
#include "gcc_extensions.h"
#include "lcd.h"
#include "font.h"
#include "backlight.h"
#include "adc.h"
#include "button-target.h"
#include "button.h"
#include "common.h"
#include "storage.h"
#include "file_internal.h"
#include "disk.h"
#include "panic.h"
#include "power.h"
#include "string.h"
#include "file.h"
#include "crc32-rkw.h"
#include "rkw-loader.h"
#include "version.h"
#include "i2c-rk27xx.h"
#include "loader_strerror.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"
/* Ungate all clocks */
"str r1, [r0, #0x18] \n"
/* Read SCU_ID to determine
* which version of bootrom we have
* 2706A has ID 0xa1000604
* 2706B and 2705 have ID 0xa100027b
*/
"ldr r1, [r0] \n"
"ldr r2, =0xa1000604 \n"
"cmp r1, r2 \n"
"bne rk27xx_new \n"
/* Setup stacks in unmapped
* iram just as rom will do.
*
* We know about two versions
* of bootrom which are very similar
* but memory addresses are slightly
* different.
*/
"rk27xx_old: \n"
"ldr r1, =0x18200258 \n"
"ldr r0, =0xaf0 \n"
"b jump_to_rom \n"
"rk27xx_new: \n"
"ldr r1, =0x18200274 \n"
"ldr r0, =0xec0 \n"
"jump_to_rom: \n"
"msr cpsr, #0xd2 \n"
"add r1, r1, #0x200 \n"
"mov sp, r1 \n"
"msr cpsr, #0xd3 \n"
"add r1, r1, #0x400 \n"
"mov sp, r1 \n"
/* Finaly jump to rkusb handler
* in bootrom.
*/
"bx r0 \n"
);
}
void main(void) NORETURN_ATTR;
void main(void)
{
char filename[MAX_PATH];
unsigned char* loadbuffer;
void(*kernel_entry)(void);
int ret;
enum {rb, of} boot = rb;
power_init();
system_init();
kernel_init();
i2c_init();
enable_irq();
adc_init();
lcd_init();
backlight_init();
button_init_device();
font_init();
lcd_setfont(FONT_SYSFIXED);
show_logo();
int btn = button_read_device();
/* if there is some other button pressed
* besides POWER/PLAY we boot into OF
*/
if ((btn & ~POWEROFF_BUTTON))
boot = of;
/* if we are woken up by USB insert boot into OF */
if (DEV_INFO & (1<<20))
boot = of;
lcd_clear_display();
ret = storage_init();
if(ret < 0)
error(EATA, ret, true);
filesystem_init();
while((ret = disk_mount_all()) <= 0)
error(EDISK, ret, true);
loadbuffer = (unsigned char*)DRAM_ORIG; /* DRAM */
if (boot == rb)
snprintf(filename,sizeof(filename), BOOTDIR "/%s", BOOTFILE);
else if (boot == of)
snprintf(filename,sizeof(filename), BOOTDIR "/%s", "BASE.RKW");
printf("Bootloader version: %s", rbversion);
printf("Loading: %s", filename);
ret = load_rkw(loadbuffer, filename, LOAD_SIZE);
if (ret <= EFILE_EMPTY)
{
error(EBOOTFILE, ret, false);
/* 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("Loading OK");
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);
}
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