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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
+++ u-boot/common/env_nand.c
@@ -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
+++ u-boot/common/environment.c
@@ -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
+++ u-boot/include/environment.h
@@ -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
+++ u-boot/common/Makefile
@@ -31,7 +31,7 @@
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_fdt.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
+++ u-boot/common/cmd_dynenv.c
@@ -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 */
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