2016-09-24 5:27 GMT+02:00 Luke Kenneth Casson Leighton <l...@lkcl.net>:
<SNIP> > > > > Let's switch to the Pocket QWERTY Computer as an example instead of > router. The A20 cpu card ships with Parabola, a desktop/workstation style > OS. I want my customers to have a good experience when they use my handheld > housing. Using an OS tailored for desktop/workstation computing is *not* a > good experience on a small screen (I've tried this with the Zipit and it > "worked", but was not very productive). I can make this transition even > *easier* for average consumer by supplying a SD card with Replicant or some > other custom libre distribution designed for small screens. > > or, you could supply multiple OS SD cards for them, and set up the > NAND to look an OS on the A20's MicroSD Card slot. > > yes, i'm keenly aware that the alteration of the OS to suit LCD size > is a Big Deal. putting it another way: it's a PAIN IN THE ASS! :) > > it's made even more complicated (for the A20) by the fact that the > people who did the sunxi u-boot and mainline kernel didn't think about > this in advance: they've specified that the LCD shall be set up by > u-boot and u-boot alone, leaving absolutely no possibility for > changing the LCD size without a total reboot! oops... > Not quite sure that is the case. U-Boot provides "early" setup, regulator and clocks etc., for u-boot output. SimpleFB takes over the settings from U-Boot (via u-boot modified device-tree). But a proper KMS/DRM driver (sunxi has something working for A13, H3, A33) may change all that. Too bad that libv got burned and refused to release his work. https://lkml.org/lkml/2015/10/30/358 http://linux-sunxi.org/Linux_mainlining_effort So yeah for SimpleFB you're bound to change the display settings in advance of a (re)boot. To the specific device. With proper KMS not. Which leads to the EOMA68 minimum allowed display resolution should be set in U-Boot. <snip>
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