1 /* 2 * Copyright 2013 Freescale Semiconductor, Inc. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License as 6 * published by the Free Software Foundation; either version 2 of 7 * the License, or (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 18 * MA 02111-1307 USA 19 * 20 */ 21 22 #include <common.h> 23 #include <spi_flash.h> 24 #include <malloc.h> 25 26 #define ESPI_BOOT_IMAGE_SIZE 0x48 27 #define ESPI_BOOT_IMAGE_ADDR 0x50 28 #define CONFIG_CFG_DATA_SECTOR 0 29 30 /* 31 * The main entry for SPI booting. It's necessary that SDRAM is already 32 * configured and available since this code loads the main U-Boot image 33 * from SPI into SDRAM and starts it from there. 34 */ 35 void spi_boot(void) 36 { 37 void (*uboot)(void) __noreturn; 38 u32 offset, code_len; 39 unsigned char *buf = NULL; 40 struct spi_flash *flash; 41 42 flash = spi_flash_probe(CONFIG_ENV_SPI_BUS, CONFIG_ENV_SPI_CS, 43 CONFIG_ENV_SPI_MAX_HZ, CONFIG_ENV_SPI_MODE); 44 if (flash == NULL) { 45 puts("\nspi_flash_probe failed"); 46 hang(); 47 } 48 49 /* 50 * Load U-Boot image from SPI flash into RAM 51 */ 52 buf = malloc(flash->page_size); 53 if (buf == NULL) { 54 puts("\nmalloc failed"); 55 hang(); 56 } 57 memset(buf, 0, flash->page_size); 58 59 spi_flash_read(flash, CONFIG_CFG_DATA_SECTOR, 60 flash->page_size, (void *)buf); 61 offset = *(u32 *)(buf + ESPI_BOOT_IMAGE_ADDR); 62 /* Skip spl code */ 63 offset += CONFIG_SYS_SPI_FLASH_U_BOOT_OFFS; 64 /* Get the code size from offset 0x48 */ 65 code_len = *(u32 *)(buf + ESPI_BOOT_IMAGE_SIZE); 66 /* Skip spl code */ 67 code_len = code_len - CONFIG_SPL_MAX_SIZE; 68 /* copy code to DDR */ 69 spi_flash_read(flash, offset, code_len, 70 (void *)CONFIG_SYS_SPI_FLASH_U_BOOT_DST); 71 /* 72 * Jump to U-Boot image 73 */ 74 flush_cache(CONFIG_SYS_SPI_FLASH_U_BOOT_DST, code_len); 75 uboot = (void *)CONFIG_SYS_SPI_FLASH_U_BOOT_START; 76 (*uboot)(); 77 } 78