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.
