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Diffstat (limited to 'include/configs/colibri_t20_sdboot.h')
-rw-r--r-- | include/configs/colibri_t20_sdboot.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/include/configs/colibri_t20_sdboot.h b/include/configs/colibri_t20_sdboot.h new file mode 100644 index 00000000000..a23d1a68237 --- /dev/null +++ b/include/configs/colibri_t20_sdboot.h @@ -0,0 +1,93 @@ +/* + * Copyright (C) 2012 Toradex, Inc. + * Portions Copyright (c) 2010, 2011 NVIDIA Corporation + * Portions Copyright (c) 2011 The Chromium OS Authors + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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 + */ + +/* + * Use this configuration for an u-boot which stores its environment in SD/MMC + * Useful if SD/MMC is selected as the boot device, so also the environment is taken from there + * + * Use colibri_t20.h for everything which is not specific to using SD/MMC as the boot device!! + */ + +/* +SD-BOOT +The sd sector numbers are used as follows: +u-boot needs to find ENV and LNX to get to the environment and the kernel, the kernel needs to find the APP partition for the rootfs. +ENV: colibri_t20_sdboot.h +Set CONFIG_ENV_MMC_OFFSET to the byte start address of ENV, take the sector address of Partid 6 (which is in 2024 byte sectors) + +LNX: colibri_t20.h +Set the u-boot environment SDBOOTCMD below, mmc read RAMloadaddr, 512byte sector start, 512byte copy length +take the sector address of Partid 7 (which is in 2024 byte sectors) + +APP: colibri_t20.h +Set the u-boot environment sdargs and the variable GPT_PRIMARY_PARTITION_TABLE_LBA below. +The kernel finds the partition with the help of the GP1/GPT partitions. The kernel commandline must include "gpt gpt_sector=xxx" +to force it to use GUID Partition Table (GPT) and to give the 512byte sector start address of the primary GUID. +Set this in +Take the start address of Partid 8 (which is in 2048 byte sectors). add 1 to the resulting 512byte block. (at pos. 0 is the MBR) + +E.g. Output during nvflash procedure on serial console: +SD Alloc Partid=2, start sector=0,num=1536 +SD Alloc Partid=3, start sector=1536,num=64 +SD Alloc Partid=4, start sector=1600,num=960 +SD Alloc Partid=5, start sector=2560,num=64 +SD Alloc Partid=6, start sector=2624,num=64 +SD Alloc Partid=7, start sector=2688,num=2048 +SD Alloc Partid=8, start sector=4736,num=512 +SD Alloc Partid=9, start sector=5248,num=500032 +SD Alloc Partid=10, start sector=505280,num=460352 + +sector start address 4736 * 2048 -> 18944 * 512 -> GPT start sector is 18945. +*/ + + +#ifndef __CONFIG_SDBOOT_H +#define __CONFIG_SDBOOT_H + +#include "colibri_t20.h" + +#undef DEFAULT_BOOTCOMMAND +#undef CONFIG_BOOTCOMMAND + +#define DEFAULT_BOOTCOMMAND \ + "run sdboot; run nfsboot" +#define CONFIG_BOOTCOMMAND DEFAULT_BOOTCOMMAND + + +#ifdef CONFIG_ENV_IS_NOWHERE +#undef CONFIG_ENV_IS_NOWHERE +#endif +#ifdef CONFIG_ENV_IS_IN_NAND +#undef CONFIG_ENV_IS_IN_NAND +#endif + +/* Environment stored in SD/MMC */ +#define CONFIG_ENV_IS_IN_MMC 1 + +#if defined(CONFIG_ENV_IS_IN_MMC) +#define CONFIG_SYS_MMC_ENV_DEV 0 /* use MMC0, slot on eval board and Iris */ +#define CONFIG_ENV_MMC_OFFSET (10496 * 512) /* Byteaddress of the beginning of the ENV partition */ +#endif + +#endif /* __CONFIG_H */ |