[PATCH] Pass barebox version to kernel

[Sascha Hauer]

Hi Peter,

On Mon, Feb 26, 2018 at 01:12:02PM +0300, Peter Mamonov wrote:
> Hi, Sasha,
> 
> On Mon, Feb 26, 2018 at 09:23:49AM +0100, Sascha Hauer wrote:
> > When userspace is interested in the barebox version it has currently no
> > way of reliably reading it. Add it to the kernel command line as it's an
> > established way to pass information from the bootloader to the kernel.
> > If CONFIG_FLEXIBLE_BOOTARGS is enabled then the barebox version is
> > passed in the "bootloader.version=" variable.
> 
> Some time ago we solved a similar problem: a number of parameters including 
> barebox version, MAC address (which may be random due to the lack of a NIC 
> EEPROM) and some vendor specific parameters are passed to the kernel via DTB.  
> A dedicated command was implemented which can either patch the existing DTB or 
> generate an overlay DTB.  In the latter case the overlay DTB is passed to the 
> kernel with the help of a new `bootm` option. Of course the latter approach 
> requires support on the kernel side.

We could of course pass the barebox version in the /chosen node. That
would require a of_register_fixup(). Why would we need an extra command
for that?
The MAC address should already be inserted into the kernel device tree
automatically.

Sascha

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