Specify where to save Barebox env

[Boulais, Marc-Andre]

The system I am working on requires to boot from the SD card. However, the Linux application needs to have the ability to change boot parameters to set the location of the kernel and rootfs for the next boot. I was planning on making the Linux application use the bareboxenv-target tool to map the Barebox environment and then modify variables accordingly. 

>From what I understand, this is possible when the environment is in NAND. Is it also true if the env. is on the SD card (barebox.env file) ? if so, how is it done ?



-----Original Message-----
From: Sascha Hauer [mailto:s.hauer at pengutronix.de] 
Sent: February-19-15 3:09 PM
To: Boulais, Marc-Andre
Cc: barebox at lists.infradead.org
Subject: Re: Specify where to save Barebox env

On Wed, Feb 18, 2015 at 07:55:46PM +0000, Boulais, Marc-Andre wrote:
> Good day,
> I am working on a phytec-phycore-OMAP446  system where the system 
> boots from the SD card. On it, I have MLO+barebox.bin (v2015.02). The 
> system boots ok.  However, when I set NV variables (from its prompt) 
> and then do a "saveenv", I would like the environment to be saved in 
> NAND. Is there a way to configure Barebox to do that ?

Normally barebox stores the environment on the medium it is started from. Looking at arch/arm/boards/phytec-phycore-omap4460/board.c:

#ifdef CONFIG_PARTITION
        devfs_add_partition("nand0", 0x00000, SZ_128K, DEVFS_PARTITION_FIXED, "xload_raw");
        dev_add_bb_dev("xload_raw", "xload");
        devfs_add_partition("nand0", SZ_128K, SZ_512K, DEVFS_PARTITION_FIXED, "self_raw");
        dev_add_bb_dev("self_raw", "self0");
        devfs_add_partition("nand0", SZ_128K + SZ_512K, SZ_128K, DEVFS_PARTITION_FIXED, "env_raw");
        dev_add_bb_dev("env_raw", "env0"); #endif

The last two lines create /dev/env0 on nand. If you boot from nand the environment should be stored there already.

Sascha


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