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Re: Guix on Mobile (Was: Interest check: U-Boot bootloader support)
From: |
Jookia |
Subject: |
Re: Guix on Mobile (Was: Interest check: U-Boot bootloader support) |
Date: |
Tue, 23 Feb 2016 07:29:51 +1100 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
On Mon, Feb 22, 2016 at 09:17:56PM +0100, Danny Milosavljevic wrote:
> Hi,
Hey!
> > Basically the bootloader would just be Linux to do some hardware init
> > (touch screen, etc)
> Actually, on ARM you usually have to do basic hardware init before Linux
> runs.
> Linux doesn't do it all. Often, booting Linux without U-Boot doesn't work.
>
> On linux-sunxi, U-Boot initializes some clocks, memory, important regulators,
> USB, MMC and the framebuffer (I'm sure I forgot some).
>
> U-Boot started out as just a tiny copy of Linux, but it has diverged a bit
> since.
This is true, I should've said that it'd go from u-boot -> linux. Rather than,
u-boot -> grub -> linux. The advantage here is Linux can do initialization of
things like the screen or touchpad.
> There are also weird things like you aren't allowed to turn stuff you need
> later off (in, say, U-Boot), because once it's off, you can't turn it on
> again (because it's off, duh) without rebooting. So kexeced Linux can find
> itself in a world of hurt.
>
> (There's a special data-passing mechanism between U-Boot and Linux in order
> to mitigate that problem - but does it work between Linux and kexec-Linux?)
Not sure you'd need to do that if you're already in a set up Linux?
> > systems with GRUB and U-Boot as Linux tends to initialize hardware better
> > than
> > them (neither U-Boot nor Libreboot like either of the EDID values of my
> > screen!)
> > and would probably allow faster bootup given you're not initializing the
> > hardware twice.
>
> I also have a screen with wrong EDID. I have a DVI<->HDMI adapter by ATI
> which contains an EDID chip in order to fake the data in order to get it to
> work. How insane is that?
Insane!
> That said, on the general interest: guix is already slooow on a fairly modern
> X200. If that ran on an armv7, it would probably be much slower. Not fun.
>
> But might be worth a try. Did someone try the non-GuixSD armv7 thing? Is the
> speed acceptable?
I already run NixOS on ARM as my desktop machine, not sure how much slower
GuixSD would be. On a phone, though it could be much worse.
Jookia.
- Interest check: U-Boot bootloader support, Jookia, 2016/02/20
- Re: Interest check: U-Boot bootloader support, Andreas Enge, 2016/02/21
- Re: Interest check: U-Boot bootloader support, Nils Gillmann, 2016/02/22
- Re: Interest check: U-Boot bootloader support, Christopher Allan Webber, 2016/02/22
- Re: Interest check: U-Boot bootloader support, Nils Gillmann, 2016/02/22
- Re: Guix on Mobile (Was: Interest check: U-Boot bootloader support), Jookia, 2016/02/22
- Re: Guix on Mobile (Was: Interest check: U-Boot bootloader support), Danny Milosavljevic, 2016/02/22
- Re: Guix on Mobile (Was: Interest check: U-Boot bootloader support), Leo Famulari, 2016/02/22
- Re: Guix on Mobile (Was: Interest check: U-Boot bootloader support),
Jookia <=
- Re: Guix on Mobile (Was: Interest check: U-Boot bootloader support), Andreas Enge, 2016/02/22
Re: Interest check: U-Boot bootloader support, Ludovic Courtès, 2016/02/23