Sorry, the previous one was 'polluted' by a change to neo1973.h, which is not [yet?] in the current u-boot git tree.
Here is a cleaned up version:
This patch adds support for CFG_ENV_OFFSET_PATCHED and CFG_ENV_OFFSET_OOB.
Both try to solve the problem of fixing the environment location in NAND flash at compile time, which doesn't work well if the NAND flash has a bad block at exactly that location.
CFG_ENV_OFFSET_PATCHED puts the environment in a global variable. You can then use the linker script to put that variable to a fixed location in the u-boot image. Then you can use bianry patching during the production flash process.
The idea of CFG_ENV_OFFSET_OOB is to store the environment offset in the NAND OOB data of block 0. We can do this in case the vendor makes a guarantee that block 0 never is a factory-default bad block.
Signed-off-by: Harald Welte laforge@openmoko.org
Index: u-boot/common/env_nand.c =================================================================== --- u-boot.orig/common/env_nand.c 2007-02-16 23:53:09.000000000 +0100 +++ u-boot/common/env_nand.c 2007-02-16 23:53:34.000000000 +0100 @@ -271,6 +271,33 @@ ulong total; int ret;
+#if defined(CFG_ENV_OFFSET_OOB) + struct mtd_info *mtd = &nand_info[0]; + struct nand_chip *this = mtd->priv; + int buf_len; + uint8_t *buf; + + buf_len = (1 << this->bbt_erase_shift); + buf_len += (buf_len >> this->page_shift) * mtd->oobsize; + buf = malloc(buf_len); + if (!buf) + return; + + nand_read_raw(mtd, buf, 0, mtd->oobblock, mtd->oobsize); + if (buf[mtd->oobblock + 8 + 0] == 'E' && + buf[mtd->oobblock + 8 + 1] == 'N' && + buf[mtd->oobblock + 8 + 2] == 'V' && + buf[mtd->oobblock + 8 + 3] == '0') { + CFG_ENV_OFFSET = *((unsigned long *) &buf[mtd->oobblock + 8 + 4]); + /* fall through to the normal environment reading code below */ + free(buf); + puts("Found Environment offset in OOB..\n"); + } else { + free(buf); + return use_default(); + } +#endif + total = CFG_ENV_SIZE; ret = nand_read(&nand_info[0], CFG_ENV_OFFSET, &total, (u_char*)env_ptr); if (ret || total != CFG_ENV_SIZE) Index: u-boot/common/environment.c =================================================================== --- u-boot.orig/common/environment.c 2007-02-16 23:53:09.000000000 +0100 +++ u-boot/common/environment.c 2007-02-16 23:53:34.000000000 +0100 @@ -29,6 +29,12 @@ #undef __ASSEMBLY__ #include <environment.h>
+#if defined(CFG_ENV_OFFSET_PATCHED) +unsigned long env_offset = CFG_ENV_OFFSET_PATCHED; +#elif defined(CFG_ENV_OFFSET_OOB) +unsigned long env_offset = CFG_ENV_OFFSET_OOB; +#endif + /* * Handle HOSTS that have prepended * crap on symbol names, not TARGETS. Index: u-boot/include/environment.h =================================================================== --- u-boot.orig/include/environment.h 2007-02-16 23:53:09.000000000 +0100 +++ u-boot/include/environment.h 2007-02-16 23:53:34.000000000 +0100 @@ -70,6 +70,10 @@ #endif /* CFG_ENV_IS_IN_FLASH */
#if defined(CFG_ENV_IS_IN_NAND) +#if defined(CFG_ENV_OFFSET_PATCHED) || defined(CFG_ENV_OFFSET_OOB) +extern unsigned long env_offset; +#define CFG_ENV_OFFSET env_offset +#else # ifndef CFG_ENV_OFFSET # error "Need to define CFG_ENV_OFFSET when using CFG_ENV_IS_IN_NAND" # endif @@ -82,6 +86,7 @@ # ifdef CFG_ENV_IS_EMBEDDED # define ENV_IS_EMBEDDED 1 # endif +#endif /* CFG_ENV_NAND_PATCHED */ #endif /* CFG_ENV_IS_IN_NAND */
Index: u-boot/common/Makefile =================================================================== --- u-boot.orig/common/Makefile 2007-02-16 23:53:15.000000000 +0100 +++ u-boot/common/Makefile 2007-02-16 23:53:34.000000000 +0100 @@ -32,7 +32,7 @@ cmd_bdinfo.o cmd_bedbug.o cmd_bmp.o cmd_boot.o cmd_bootm.o \ cmd_cache.o cmd_console.o \ cmd_date.o cmd_dcr.o cmd_diag.o cmd_display.o cmd_doc.o cmd_dtt.o \ - cmd_eeprom.o cmd_elf.o cmd_ext2.o \ + cmd_dynenv.o cmd_eeprom.o cmd_elf.o cmd_ext2.o \ cmd_fat.o cmd_fdc.o cmd_fdos.o cmd_flash.o cmd_fpga.o \ cmd_i2c.o cmd_ide.o cmd_immap.o cmd_itest.o cmd_jffs2.o \ cmd_load.o cmd_log.o \ Index: u-boot/common/cmd_dynenv.c =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ u-boot/common/cmd_dynenv.c 2007-02-16 23:53:34.000000000 +0100 @@ -0,0 +1,85 @@ +/* + * (C) Copyright 2006-2007 OpenMoko, Inc. + * Author: Harald Welte laforge@openmoko.org + * + * 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 + */ + +#include <common.h> +#include <command.h> +#include <malloc.h> +#include <environment.h> +#include <nand.h> +#include <asm/errno.h> + +#if defined(CFG_ENV_OFFSET_OOB) + +int do_dynenv(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +{ + struct mtd_info *mtd = &nand_info[0]; + int ret, size = 8; + uint8_t *buf; + + char *cmd = argv[1]; + + buf = malloc(mtd->oobsize); + if (!buf) + return -ENOMEM; + + if (!strcmp(cmd, "get")) { + ret = mtd->read_oob(mtd, 8, size, (size_t *) &size, (u_char *) buf); + + if (buf[0] == 'E' && buf[1] == 'N' && + buf[2] == 'V' && buf[3] == '0') + printf("0x%08x\n", *((u_int32_t *) &buf[4])); + else + printf("No dynamic environment marker in OOB block 0\n"); + + } else if (!strcmp(cmd, "set")) { + unsigned long addr; + if (argc < 3) + goto usage; + + buf[0] = 'E'; + buf[1] = 'N'; + buf[2] = 'V'; + buf[3] = '0'; + addr = simple_strtoul(argv[2], NULL, 16); + memcpy(buf+4, &addr, 4); + + printf("%02x %02x %02x %02x - %02x %02x %02x %02x\n", + buf[0], buf[1], buf[2], buf[3], + buf[4], buf[5], buf[6], buf[7]); + + ret = mtd->write_oob(mtd, 8, size, (size_t *) &size, (u_char *) buf); + } else + goto usage; + + free(buf); + return ret; + +usage: + free(buf); + printf("Usage:\n%s\n", cmdtp->usage); + return 1; +} + +U_BOOT_CMD(dynenv, 3, 1, do_dynenv, + "dynenv - dynamically placed (NAND) environment\n", + "dynenv set off - set enviromnent offset\n" + "dynenv get - get environment offset\n"); + +#endif /* CFG_ENV_OFFSET_OOB */