Came across this thread in my attempts to get u-boot booting off a sdcard on a A31 based tablet.
Would there have been in more work on this since April? Maks. On Thursday, 3 April 2014 19:31:44 UTC+11, Maxime Ripard wrote: > > On Tue, Apr 01, 2014 at 09:55:44PM +0200, Olliver Schinagl wrote: > > On 03/31/2014 08:27 AM, Chen-Yu Tsai wrote: > > >Hi Hans, > > > > > >On Sun, Mar 30, 2014 at 8:04 PM, Hans de Goede <[email protected] > <javascript:>> wrote: > > >>Hi, > > >> > > >>After wens pointed me to: > > >> > http://git.rhombus-tech.net/?p=u-boot.git;a=blob;f=arch/arm/cpu/armv7/sunxi/dram_sun6i.c;h=9275ca21ac99592c7d520a41c0914b359c27b913;hb=refs/heads/lichee/jb-4.2.2-a31 > > > >> > > >>I've tried to get a full SPL going on sun6i. No luck sofar, > > >>dropping in dram_sun6i.[c,h] +pll5 config seems to get the dram > > >>going, at least get_ram_size() likes it. But I cannot get the > > >>mmc to work in the SPL. I've narrowed this down to 2 problems, > > >>which I believe are related: > > >> > > >>1) The mmc controller will simply not work with pll6 as source, > > >>after adding a test for the pll6 lock bit I believe this is caused > > >>by pll6 never locking. > > >> > > >>2) When switching the mmc controller clocksource to OSC24M, then > > >>it does work, but gets stuck reading the first sector from the card. > > >>I believe this happens because the card is only being supplied 3.0V' > > >>rather then 3.3V. > > >> > > >>Note that the same code works fine in the no SPL u-boot when loaded > > >>through boot0 + boot1. > > >> > > >>Likely wrong power supply voltages are the culprit in both cases > > >>(the A31 also has a vdd-pll power pin. > > >> > > >>So it looks like the next step is to first get the pmic going in > > >>u-boot (which will be useful even if booted through boot0 + 1, to > > >>enable the nic-phy if nothing else). > > > > > >The A23 lichee u-boot has drivers for P2WI (used in sun6i) and RSB > > >(reduced serial bus, used on A23): > > Are they not the same? I haven't looked I admit, I just figured they > > changed the name a little to make it sound distinctive. > > We don't have much details, but the bus itself looks different, since > it supports many devices, which is impossible with the p2wi. > > > Are they similar at all? If so, I guess that the i2c vs p2wi > > discussion held a few days ago is moot then :) > > Why so? > > -- > Maxime Ripard, Free Electrons > Embedded Linux, Kernel and Android engineering > http://free-electrons.com > -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
