mxc_nb.c

i.mx31 3DS平台Nandboot引导程序源码

/*
 * Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/*!
 * @file mxc_nb.c
 * 
 * @brief SPL source file for NANDBoot.
 *
 * NANDboot is used for booting from NAND flash.\n 
 * NAND Flash can be configured as a booting device. This requires an 
 * Initial Program Loader (IPL) to be written on the first block of the 
 * NAND Flash which performs the initial booting operations. Since IPL has 
 * the size limit, it loads Secondary Program Loader (SPL) which initializes 
 * the system and loads the OS. \n
 * This file contians the SPL which gets loaded by the IPL 
 * 
 * @ingroup NANDboot
 */

#include "mxc_nb.h"
#include "mxc_nb_uart.h"

extern badblock_list[];
/* Block 1 (16K offset) of the 8 bit 32 MB NAND flash contains the kernel image */
#define KERNEL_START_BLOCK   1       

/*!
 * This function initially does the watchdog and UART initialization.  It then
 * displays messages on the terminal. It displays menu at the terminal which
 * provides different options for the kernel loading and then waits for user
 * inputs.  For executing the Linux kernel it calls the \b jump_to_kernel
 * assembly routine.
 */
void mxcnb_spl(void)
{
        volatile U32 *pmem = DESTN_ADDR;
        U32 *pflash = SOURCE_ADDR;
        U8 *pcmdline = CMDLINE_ADDR;
        U8 hexstr[20];
        int addr, i = 0, timeout = MENU_TIMEOUT;
        U8 boot_option, ch;
        U32 kernel_start_block = KERNEL_START_BLOCK;

	*(volatile U32 *)(CCM_BASE_ADDR + 0x20) = 0x00300C30;
	*(volatile U32 *)(CCM_BASE_ADDR + 0x24) = 0x00FF3FF0;
	*(volatile U32 *)(CCM_BASE_ADDR + 0x28) = 0xFFFFC300;

#ifdef MX21
	mx2_init();
	_reg_CRM_PCDR0=(_reg_CRM_PCDR0&0xffff0fff)|0x00007000;
	for(i=0;i<100000;i++);
#endif

        /* Initialize Watchdog Timer */
        mxcnb_wd_init();
        /* Initialize UART */
        mxcnb_uart_init();
                
        /* service WDOG Timer */
        mxcnb_wd_reset();
        
#if UNIT_TEST
        mxcnb_uart_unit_test();
#endif
        mxcnb_scan_badblocks();

        /* Display message */
        mxcnb_outstring("\n\nLinux 2.6 Freescale MXC processor \n");
menu:   
        mxcnb_outstring("\n\nChoose an option from below:\n\n");
        mxcnb_outstring("1. Load kernel to RAM and then boot from [0x");
        mxcnb_puthex(pmem);
        mxcnb_outstring("]\n");
        mxcnb_wd_reset();
#if (CHANGE_KERNEL_LOADING_ADDRESS == 1)
        mxcnb_outstring("2. Change kernel loading address [0x");
        mxcnb_puthex(pmem);
        mxcnb_outstring("]\n");
#endif         
#if (CHANGE_COMMAND_LINE_OPTION == 1)
        mxcnb_outstring("3. Enter command line option for kernel\n"); 
#endif 

#if (CHANGE_COMMAND_LINE_ADDRESS == 1)                
        mxcnb_outstring("4. Change command line option address [0x");
        mxcnb_puthex(pcmdline);
        mxcnb_outstring("]\n");
#endif
        mxcnb_outstring("\n   Please enter selection ->  ");

        mxcnb_wd_reset();       

#ifndef BOOT_TIME
        /* Loop to receive input from user */
        do {
                mxcnb_outstring("\b ");
                if(!mxcnb_timeout(timeout)) {
                        boot_option = mxcnb_getdata();
                        mxcnb_putdata(boot_option);
                        if (boot_option >= 0x20) {
                                mxcnb_putdata('\b');
                                mxcnb_putdata(boot_option);
                        }

                } else {
                         boot_option = '1';
                         mxcnb_outstring("Timeout occured \n\n");
                }
        } while ((boot_option  < '1') || (boot_option > '4'));

#else
	boot_option = '1';
#endif

        mxcnb_wd_reset();

        mxcnb_outstring("\n\n");
        
        switch (boot_option) {

        /* Case to copy kernel to RAM from NAND flash and boot */
        case '1': 
                mxcnb_outstring("-->Booting from RAM...\n");
#ifdef BOOT_TIME
                mxcnb_outstring("Before copy kernel, EPIT value: ");
		mxcnb_puthex(*(volatile unsigned long*)(EPIT1_BASE_ADDR + 0x10));
		mxcnb_outstring("\n");
#endif
                if (!mxc_nfb_copykernel((U16*)pmem, kernel_start_block)) {
                        mxcnb_outstring("Bad kernel...exiting...\n");
                        goto menu;
                }
                mxcnb_wd_reset();
#ifdef MX21
	mx21_module_init();
#endif
#ifdef BOOT_TIME
                mxcnb_outstring("After copy kernel, EPIT value: ");
		mxcnb_puthex(*(volatile unsigned long*)(EPIT1_BASE_ADDR + 0x10));
		mxcnb_outstring("\n");
#endif
                mxcnb_outstring("-->Starting kernel...\n");
                jump_to_kernel(0, PROC_ID, pcmdline, pmem);
                break;

#if (CHANGE_KERNEL_LOADING_ADDRESS ==1)
                 /* Case for providing Linux kernel destination address */
        case '2' :
                mxcnb_outstring("-->Address (4 bytes hex): 0x");
                mxcnb_wd_reset();
                addr = mxcnb_gethex(hexstr);
                if (addr == -1) {
                            mxcnb_outstring(
                              "\n-Invalid Linux kernel destination address");
                              goto menu;
                }
                pmem = (U32*)addr;
                mxcnb_puthex(addr);
                mxcnb_wd_reset();
                goto menu;
                break;                
#endif

#if (CHANGE_COMMAND_LINE_OPTION == 1)
        /* Case to enter new command line option */
        case '3': 
                mxcnb_setup_taglist();
                goto menu;
                break;
#endif
                                
        /* Case to change the address location for command line argument */
#if (CHANGE_COMMAND_LINE_ADDRESS == 1)                
        case '4': 
                mxcnb_outstring(
                        "-->New command line address (4 bytes hex): 0x");
                mxcnb_wd_reset();
                addr = (int)mxcnb_gethex(hexstr);

                if (addr == -1) {
                        mxcnb_outstring(
                                "\n-Invalid Linux kernel location address");
                        goto menu;
                }

                pcmdline = (U8*)addr;
                mxcnb_puthex(addr);
                mxcnb_wd_reset();
                goto menu;
                break;
#endif 
        /* default case */
        default: 
                mxcnb_outstring("Invalid Entry");
                goto menu;
                break;
        }
}