.long 0xEA00000A
.long 0x4E4F4765
.long 0x3054422E
.long 0x00000000
.long 0x00001000
.long 0x00000000
.long 0x00000000
.long 0x00000000
.long 0x00000000
.long 0x00000000
.long 0x00000000
.long 0x00000000

mov r0, #0x01000000
orr r0,r0,#0x00C20000
orr r0,r0,#0x00000068
ldr r0,[r0]
orr r0,r0, #0x0020
mov r1, #0x01000000
orr r1,r1,#0x00C20000
orr r1,r1,#0x00000068
str r0,[r1]

mov r0, #0x01000000
orr r0,r0,#0x00C20000
orr r0,r0,#0x00000800
orr r0,r0,#0x000000D8
ldr r0,[r0]
orr r0,r0, #0x0010
mov r1, #0x01000000
orr r1,r1,#0x00C20000
orr r1,r1,#0x00000800
orr r1,r1,#0x000000D8
str r0,[r1]

mov r0, #0x01000000
orr r0,r0,#0x00C20000
orr r0,r0,#0x00000800
orr r0,r0,#0x000000E8
ldr r0,[r0]
orr r0,r0, #0x0200
mov r1, #0x01000000
orr r1,r1,#0x00C20000
orr r1,r1,#0x00000800
orr r1,r1,#0x000000E8
str r0,[r1]

#define uint32_t unsigned long int

#define CCMBase 0x01C20000 /* clock module */

#define Def_APB0_Gating (CCMBase + 0x68)

#define GPIOBase 0x01C20800
#define GPIOIncrement 0x24

#define ALLWINNER_GPIO_A GPIOBase
#define ALLWINNER_GPIO_B (GPIOBase + (1*GPIOIncrement))
#define ALLWINNER_GPIO_C (GPIOBase + (2*GPIOIncrement))
#define ALLWINNER_GPIO_D (GPIOBase + (3*GPIOIncrement))
#define ALLWINNER_GPIO_E (GPIOBase + (4*GPIOIncrement))
#define ALLWINNER_GPIO_F (GPIOBase + (5*GPIOIncrement))
#define ALLWINNER_GPIO_G (GPIOBase + (6*GPIOIncrement))
#define ALLWINNER_GPIO_H (GPIOBase + (7*GPIOIncrement))
#define ALLWINNER_GPIO_I (GPIOBase + (8*GPIOIncrement))

#define Port_CFG0 0x00 /* pin direction and function 0 to 7 */
#define Port_CFG1 0x04 /* pin direction and function 8 to 15 */
#define Port_CFG2 0x08 /* pin direction and function 16 to 24 */
#define Port_CFG3 0x0C /* pin direction and function 25 to 32 */
#define Port_DAT 0x10
#define Port_DRV0 0x14
#define Port_DRV1 0x18
#define Port_PUL0 0x1C

/* A workaround for https://patchwork.ozlabs.org/patch/622173 */
void __attribute__((section(".start"))) __attribute__((naked)) start(void)
{
__asm__ __volatile__ (".long 0xEA00000A \n" // jump main()
".long 0x4E4F4765 \n" // eGON
".long 0x3054422E \n" // .BT0
".long 0x00000000 \n" // checksum
".long 0x00001000 \n" // 4kB size
".long 0x00000000 \n" // header size!
".long 0x00000000 \n"
".long 0x00000000 \n"
".long 0x00000000 \n"
".long 0x00000000 \n"
".long 0x00000000 \n"
".long 0x00000000 \n");
/*
u32, Jump to address
8 * u8, Magic "eGON.BT0" (no \n)
32u, checksum for boot0
32u, length for boot0
32u, header size of boot0
4 * u8, header version
4 * u8, Boot_vsn
4 * u8, eGON_vsn
8 * u8, platform information
*/
}

void main(void)
{

volatile uint32_t *APB0Gating;
volatile uint32_t *portGConfig;
volatile uint32_t *portGData;

//setup pointers for registers

APB0Gating = (volatile uint32_t*)(Def_APB0_Gating);
portGConfig = (volatile uint32_t*)(ALLWINNER_GPIO_G+Port_CFG1);
portGData = (volatile uint32_t*)(ALLWINNER_GPIO_G+Port_DAT);


//enable clocking for GPIO

*APB0Gating|=0x0020;

//configure port G pin 9 to output

*portGConfig|=0x10;

//set output to on:

*portGData|=0x0200;

Loop:

goto Loop;
}

Note: the A13-OLinuXino-SD card which we have on our webshop contain same image on 4GB Class10 fast micro sd-card, if you want to use this image please use Class10 fast card or the performance of Linux will slow down