Re: /dev/env0 not found

[Sascha Hauer <s.hauer@pengutronix.de>]

Hi Nataraj,

On Fri, Jan 14, 2011 at 12:01:25PM +0000, Nataraj S Narayan wrote:
> Hi
> 
> How I come I don't have /dev/env0? I am on at91sam9263ek.
> 
> 9263-EK:/ saveenv
> saving environment
> could not open /dev/env0: Read-only file system
> 
> 9263-EK:/ ls -l /dev/env0
> ls: /dev/env0: No such file or directory
> 
> 9263-EK:/ ls -l /dev/
> cr-------- 4294967295 zero
> crw-------       3785 defaultenv
> crw------- 4294967295 mem
> crw-------   67108864 ram0
> crw-------  268435456 nand0
> cr--------    8388608 nand_oob0
> crw-------         32 phy0
> crw------- 3851423744 nor-352321538
                           ^^^^^^^^^^

This should normally be nor0. The name comes from
info->cdev.name = asprintf("nor%d", dev->id);
in cfi_probe. dev->id is normally initialized to -1 in
arch/arm/boards/at91sam9263ek/init.c, then changed to 0 in
register_device:

	if (new_device->id < 0) {
		new_device->id = get_free_deviceid(new_device->name);
	}
...

I have no idea why this does not work in your case, so it's maybe best
to add some printfs in the path I just described to see where dev->id is
actually changed to such a bogus value.

Note that on the at91sam9263ek the environment partition is added as
follows:

#if defined(CONFIG_DRIVER_CFI) || defined(CONFIG_DRIVER_CFI_OLD)
	devfs_add_partition("nor0", 0x00000, 0x40000, PARTITION_FIXED, "self");
	devfs_add_partition("nor0", 0x40000, 0x20000, PARTITION_FIXED, "env0");
#elif defined(CONFIG_NAND_ATMEL)
	devfs_add_partition("nand0", 0x00000, 0x80000, PARTITION_FIXED, "self_raw");
	dev_add_bb_dev("self_raw", "self0");
	devfs_add_partition("nand0", 0x40000, 0x40000, PARTITION_FIXED, "env_raw");
	dev_add_bb_dev("env_raw", "env0");
#endif

This means that when both nand and nor flash is compiled in the
environment which be in nor flash. On i.MX we have a way to figure out
if barebox is started from nor or from nand and locate the environment
in the same device as barebox is started from. I don't know if that's
possible on the Atmel processors though.

Sascha


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