Hi Octavio,
On 09/19/2012 06:15 PM, Otavio Salvador wrote:
On Wed, Sep 19, 2012 at 9:58 PM, Eric Nelson
<eric.nel...@boundarydevices.com> wrote:
On 09/19/2012 04:51 PM, Otavio Salvador wrote:
I sort of agree; do you use 2 or 3 partitions in this case?
Or 1 or 9?
I'm actually not kidding here. The current Freescale Android image
(R13.4-Beta) actually does want 9 partitions for a bunch of stuff
like a 'recovery' partition, a 'vendor' partition, etc.
Or even 0? Windows users have been known to use SD cards straight out
of the box with no partition table.
In short, this is something that can't be solved in the general case,
so I think it's best for the main-line U-Boot code to not try and
provide policy, only functionality.
I agree; but mainline could have defaults that works at least for
usual U-Boot hacker. That's why I asked how many you use.
To that end, we've tried to standardize on something simple: the presence of
a file named '6q_bootscript' on one of the SD cards that can handle these
sorts of userspace details:
http://boundarydevices.com/u-boot-conventions-for-i-mx6-nitrogen6x-and-sabrelite/
This allows all of the userspace bits to go into the userspace filesystem,
but still allows machine-specific like the type of display connected to
be saved in the environment.
Using this approach, you can load kernel(s) or RAM disks from anywhere
that U-Boot can reach without re-compiling U-Boot.
This is indeed nice.
Isn't using 'mkenvimage' in OE a better route? That way, the environment
can
change with the userspace decision.
In fact in OE we have a patch for it. Usually we don't call mkenvimage
for it but I like the idea to add this feature there later.
The best part of doing it in OE is that the same commit should be able to
update both the environment variables (or boot script) and the parts which
depend
on it (like creation of the filesystem image(s)).
Yes; I will work in a generic way for it in OE ... I like the idea and
also see the added value for the flexibility.
After MX23 I will focus on this ;-) (or Marek kills me :P)
This doesn't solve the question:
Better to have 2 or 3 partition layout by default in mainline?
I suspect that this question isn't for me, since I'm not sure which
userspace(s) we're targeting.
Heck, I didn't know that OE was still kicking... I kinda had the
impression that Yocto had taken it over ;)
Regards,
Eric
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