## How to blink led of tiny210 using SD-boot
Hint: Only 8K binary file with parity code at the beginning can be executed.
so we get a tool mktiny210spl.exe from uboot, make the .bin file to size 8K then burn it to SD card.
### get mktiny210spl.exe from uboot
mkdir 1-led-s
cd 1-led-s
-> copy tiny210-u-boot-version2.1.tar.gz in 1-led-s
tar zxf tiny210-u-boot-version2.1.tar.gz
cp tiny210-u-boot-version2.1/board/samsung/tiny210/tools/mktiny210spl.exe .
### write led.s (source code) and Makefile
vi led.s
.global _start
_start:
ldr r0, =0x1
ldr r1, =0xe0200280
str r0, [r1]
loop:
ldr r0, =0x0
ldr r1, =0xe0200284
str r0, [r1]
bl delay
ldr r0, =0x1
ldr r1, =0xe0200284
str r0, [r1]
bl delay
b loop
delay:
ldr r0, =0x100000
go_on:
sub r0, r0, #1
cmp r0, #0
bne go_on
mov pc, lr
vi Makefile
all:
arm-linux-as led.s -o led.o
arm-linux-ld led.o -o led.elf
arm-linux-objcopy -O binary led.elf led.bin
arm-linux-objdump -d led.elf > led.lst
./mktiny210spl.exe led.bin sd-led.bin
make
-> ls -l *.bin
-rwxr-xr-x 1 limingth limingth 76 2012-05-11 18:21 led.bin
-rw-r--r-- 1 limingth limingth 8192 2012-05-11 18:21 sd-led.bin
### write sd-led.bin to SD-Card
insert sd card
dmesg | grep sdb
-> /dev/sdb should be found
sudo dd iflag=dsync oflag=dsync if=sd-led.bin of=/dev/sdb seek=1
-> 记录了16+0 的读入
记录了16+0 的写出
8192字节(8.2 kB)已复制，0.209805 秒，39.0 kB/秒
### now you can test if SD-boot can blink led1
insert SD card to slot (CON10 of tiny210)
switch to SDBOOT of S2
reset and see if it works!
[ 此帖被limingth在2012-05-13 08:47重新编辑 ]
