/********************************************************************************************
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* File: bootstrap.c
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* Version: 1.0.0
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* Copyright: 2013 (c) Guo Wenxue <guowenxue@gmail.com>
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* Description: This C code is the first stage bootloader(named bootstrap)
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* main code, test on OK6410 board.
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* ChangeLog: 1, Release initial version on "Mon Feb 25 23:02:41 CST 2013"
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*
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*******************************************************************************************/
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#include "s3c6410.h"
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#include "common.h"
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inline void delay(unsigned long loops)
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{
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__asm__ volatile ("1:\n" "subs %0, %1, #1\n" "bne 1b":"=r" (loops):"0"(loops));
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}
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/* OK6410 LED1~LED4 use GPIO: GPM0~GPM3 */
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static void led_init(void)
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{
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unsigned int regv;
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/* Set GPM0~GPM3 as GPIO output mode*/
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regv = s3c_readl(GPMCON);
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regv = (regv & ~0xffffU) | 0x1111U;
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s3c_writel(regv, GPMCON);
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/* Disable GPM0~GPM3 pull-up/down */
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regv = s3c_readl(GPMPUD);
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regv = (regv & ~0xffU) | 0x00U;
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s3c_writel(regv, GPMPUD);
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/* Set GPM0~GPM3 as high level to turn LED1~LED3 off */
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regv = s3c_readl(GPMDAT);
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regv = (regv & ~0xffU) | 0xfU;
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s3c_writel(regv, GPMDAT);
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}
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static void led_display(unsigned int data)
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{
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unsigned int regv;
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regv = s3c_readl(GPMDAT);
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regv = (regv & 0xf) & ((~data) & 0xf);
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s3c_writel(regv, GPMDAT);
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}
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static int ddr_test(void)
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{
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int i;
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unsigned int val;
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for (i=0; i<0x1000; i++)
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{
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s3c_writel(0x55aaaa55, (MEMORY_BASE_ADDRESS + i*0x100));
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val = s3c_readl(MEMORY_BASE_ADDRESS + i*0x100);
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if (val != 0x55aaaa55)
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return -1;
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s3c_writel(0xaa5555aa, (MEMORY_BASE_ADDRESS + i*0x100));
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val = s3c_readl(MEMORY_BASE_ADDRESS + i*0x100);
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if (val != 0xaa5555aa)
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return -1;
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}
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return i;
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}
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int main()
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{
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int rv = 0;
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char *addr = (char *)MEMORY_BASE_ADDRESS;
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led_init();
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led_display(0x0f);
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serial_init(CONFIG_BAUDRATE);
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serial_puts("Bootstrap already running...\n");
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rv = ddr_test();
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if (rv < 0)
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{
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serial_puts("ddr test faild.\n");
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}
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else
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serial_puts("1. ddr init/test successful.\n");
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serial_puts("Xmodem Receive now!\n");
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xmodem_recv(addr);
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return 0;
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}
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