Re: [RFC] Dynamic boot logo

["hinko.kocevar@cetrtapot.si" <hinko.kocevar@cetrtapot.si>]

Rodolfo Giometti wrote:
> Hello,
> 
> I'd like to have some suggestions from you about how I can implement
> the "dynamic boot logo" feature in Linux reading the logo from the
> flash memory.

We would like to have this feature on my embedded system too! Currently 
we are using bitmap file converted to standard header file and then 
compiled in the kernel, which is not flexible at all.

> 
> In my custom board, using u-boot I read a compressed bitmap from the
> flash memory and then I use it to display the logo, so users just have
> to change flash content in order to change then boot logo without
> recompiling u-boot.
> 
> Could it be possible in Linux also? Which could be, in your opinion,
> the best way to solve this problem?

Maybe you could access the same flash memory from the Linux too - using 
either physical or virtual address space, eg. by I/O or memory mapping it.
Another way could be using a dedicated kernel module for the job - eg. 
you compile the graphic support in the module and the when update is 
needed only module can be replaced in the file system leaving kernel 
intact (at least while kernel version does not change).

In our case, a) we can not use boot loader and, b) we use kernel with 
module support disabled, so these variants were not tested on our side.

HTH,
hinko


-- 
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4000 Kranj
Slovenia, Europe
Tel. +386 (0) 4 280 66 03
E-mail: hinko.kocevar@cetrtapot.si
Http: www.cetrtapot.si


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