Busybox utils to set u-boot environment?

[Marc Leeman]

> no, nor will there probably ever be due to the nature of u-boot ... every 
> single board can store its environment in different types of flash in 
> different sectors at different offsets in different magical ways ... there is 
> no common infrastructure to query such information from kernel/user space
> 
> you should setup your mtd maps to create a separate partition for your u-boot 
> env sector and then use the mtd-utils package to read/write it from userspace

I do not fully agree with you: U-Boot already contains a firmware
version (fw_setenv and fw_printenv) of the U-Boot setenv and the
printenv commands.

[mleeman at neo u-boot-1.2.0]$ find . -name fw_env.c
./tools/env/fw_env.c

It even operates similarly as busybox (tm) with argv[0] to distinguish
between setenv and printenv (I added a editenv to set multiple variables
at one pass only erasing one time the sector).

As for the querying of the information, strictly speaking, there is not
really a need for this since the developer needs to specify it in a
config file:

[mleeman at neo u-boot-1.2.0]$ cat ../../flashfs/etc/fw_env.config
# Configuration file for fw_(printenv/saveenv) utility.
# Up to two entries are valid, in this case the redundand
# environment sector is assumed present.

# MTD device name       Device offset   Env. size       Flash sector
# size
/dev/mtd1               0x0000          0x20000         0x20000
/dev/mtd2               0x0000          0x20000         0x20000

That's not really different as e.g. httpd.conf...

Finally, strictly speaking, you don't need a seperate mtd sector for
your environment, you could e.g. store it at the end of you U-Boot
sectors. If that is wise, that's an entirely different matter of course.

-- 
  greetz, marc
Is everybody aboard this ship kinkoid?
	Chiana - A Bug's Life
chiana 2.6.18-4-ixp4xx #1 Tue Mar 27 18:01:56 BST 2007 GNU/Linux
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