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-rw-r--r--tools/env/fw_env.config5
1 files changed, 5 insertions, 0 deletions
diff --git a/tools/env/fw_env.config b/tools/env/fw_env.config
index 6f216f9c64..f0f66aa373 100644
--- a/tools/env/fw_env.config
+++ b/tools/env/fw_env.config
@@ -4,6 +4,7 @@
# Notice, that the "Number of sectors" is not required on NOR and SPI-dataflash.
# Futhermore, if the Flash sector size is ommitted, this value is assumed to
# be the same as the Environment size, which is valid for NOR and SPI-dataflash
+# Device offset must be prefixed with 0x to be parsed as a hexadecimal value.
# NOR example
# MTD device name Device offset Env. size Flash sector size Number of sectors
@@ -18,8 +19,12 @@
# NAND example
#/dev/mtd0 0x4000 0x4000 0x20000 2
+# On a block device a negative offset is treated as a backwards offset from the
+# end of the device/partition, rather than a forwards offset from the start.
+
# Block device example
#/dev/mmcblk0 0xc0000 0x20000
+#/dev/mmcblk0 -0x20000 0x20000
# VFAT example
#/boot/uboot.env 0x0000 0x4000