main.c

来自「ks8695 loader > > > > > &」· C语言 代码 · 共 82 行

/*****************************************
 Copyright (c) 2001-2002
 Sigma Designs, Inc. All Rights Reserved
 Proprietary and Confidential
 *****************************************/

/* This is file is part of the Jasper PVP boot loader */

#include "config.h"
#include "uart.h"
#include "util.h"
#include "jasper.h"
#include "bootflash.h"
#include "em85xx_pbi.h"

int boot_status;

#include "jasper.h"
void EM85xx_WritePIO (int PIONumber, int Data)
{
	// don't assume that PIO is output
	if (PIONumber < 16)
	{
		*PIO_0_DATA_REG = ((Data? 0x00010001:0x00010000) << PIONumber);
		*PIO_0_DIR_REG = (0x00010001 << PIONumber);
	}
	else
	{
		*PIO_1_DATA_REG = ((Data? 0x00010001:0x00010000) << (PIONumber-16));
		*PIO_1_DIR_REG = (0x00010001 << (PIONumber-16));
	}
}

// ************************
// This is the normal entry
// ************************
int entry (void)
{
	unsigned long kload = KERNEL_LOAD_ADDRESS;

#ifdef ENABLE_UART
	InitUart ();
	PrintUart ("\r\nEM85xx Bootloader v" BOOTLOADER_VERSIONSTR " (" __DATE__ " " __TIME__ ")\r\n", -1);
	PrintUart ("\r\n", -1);
#endif

	// For old envision board - enables network
	// PIO1_3, PIO1_4 to low
//	EM85xx_WritePIO (3 + 16, 0);
//	EM85xx_WritePIO (4 + 16, 0);

#if 1
        // Setup PBI bus
        *PB_SL_CTRL = PBI_IN_IDE_PADS;
        *PB_CS_CONFIG &= ~(0x1111 << 0);   // 0x3000
        *PB_CS_CONFIG |= PBI_IDE << 0;   // 0x3000

        // Enable bus output
        *(unsigned long *)0x00500B40 = 0x10000;        // enable IDE output
#endif

	if (!try_boot_flash (kload, ROMFS_START_ADDRESS))
	{
		PrintUart ("boot_flash failed\r\n", 64);
		goto boot_failed;
	}

	// return the adress to jump to
	PrintUart ("jumping to ", 64);
	PrintLong ((unsigned long)kload);
	PrintUart ("\r\n", 64);
	return (int)kload;

boot_failed: // What to do when everything fails
	while (1);
	return -1;
}