On Tue, Dec 9, 2014 at 6:25 PM, Hans de Goede <hdego...@redhat.com> wrote: > On 09-12-14 11:17, Chen-Yu Tsai wrote: >> On Tue, Dec 9, 2014 at 2:53 AM, Hans de Goede <hdego...@redhat.com> wrote: >>> On 08-12-14 15:28, Chen-Yu Tsai wrote: >>>> On Mon, Dec 8, 2014 at 4:27 AM, Hans de Goede <hdego...@redhat.com> >>>> wrote: >>>>> >>>>> >>>>> Hi, >>>>> >>>>> This is still a bit rough around the edges, I'll clean it up as >>>>> time permits and then post it upstream. >>>>> >>>>> In the mean time people interested can find $subject here: >>>>> https://github.com/jwrdegoede/u-boot-sunxi/commits/sunxi-wip >>>> >>>> >>>> >>>> Hopefully I'll get around to testing this. BTW, what tablet do >>>> you have? >>> >>> >>> >>> I've an Ippo q8h v1.2, there are at least 2 differences from the >>> v5 you've. The dram clk speed and zq value are different, and the wifi >>> is different. The wifi does not matter for u-boot, but does mean we >>> need separate dtb files for the 2. >>> >>> My u-boot sunxi-wip branch has a defconfig for the v1.2, you should be >>> able to copy that over to the v5 defconfig, adjust dram clk and zq values >>> with the ones from the v5 fix, change v1.2 to v5 in the CONFIG_FDTFILE >>> setting and thats it. >>> >>> Let me know if this works, then I'll also include an update for the v5 >>> defconfig to enable the SPL when I send this upstream. >> >> >> Just gave it a spin, and it works. The dram clock and zq can be >> found in sunxi-boards. > > > Good, I'll update my patch-set to reflect this. > >> Note that the actual settings fetched from >> stock u-boot has the highest bit of tpr13 set, disabling auto >> detection AFAICU. As you've not implemented that part, I used >> auto detection and it seems to work. > > > It is implemented in the actual dram_init code, but for now I've > all the dram_paras hardcoded except the clk and the zq value. If > autodetect works I see no reason to change this, but for future models, > if necessary the code for dealing with manual config is there, to test > just put the values directly in the dram_para struct at the top of > dram_sun8i.c . > >> The only problem I have now is it has no connectivity to the >> outside world lol. I would've liked a v2, with a Realtek USB >> WiFi chip. What chip does the v1.2 have? > > > An sdio based chip, the RDA RDA5990P, as mentioned here: > > http://linux-sunxi.org/Ippo_q8h#Q8H-V1.2
Not sure this would require a different DT. Probably the GPIOs are different. > It does have an empty spot on the pcb for a usb wifi module, I plan to > hookup a usb connector to that one of these days, and see if I can get > a USB host working this way. I should do that too. Nice way to hook up ethernet. Small problem would be getting 5V from the board for VBUS. Also I have a schematic file for A23 that someone provided me. I don't remember who... It lists: - ALDO2 connected to VCC-DLL @ 2.5V - ALDO3 to VCC-PLL and AVCC (analog power) @ 3.0V - DCDC1 to all the normal stuff @ 3V - DCDC2 to VDD-SYS @ 1.1V - DCDC3 to VDD-CPU (main cpu) @ 1.1V (1.26V in my fex file) - DCDC5 to VCC-DRAM @ 1.1V (1.5V in my fex file) - DC5LDO to VDD-CPUS (special cpu) >>>>> ChenYu, this also has a mmc fix which you may find interesting, >>>>> it may explain some of the problems with mmc you've been having >>>>> on both the A80 board, as well as the A31 dev board you've. >>>> >>>> >>>> >>>> Yes. With that fix my Hummingbird A31 boots properly without >>>> raising DCDC1 to 3.3V. >>>> >>>> Thanks! I'll send the defconfig out later. >>> >>> >>> >>> Good, so I guess this means that DCDC1 should be 3V for your board, >>> since that is what the factory firmware uses, right ? >>> >>> I guess it is time to make DCDC1 voltage configurable. >> >> >> 3V seems to be the lowest tolerable voltage for some bits. Making it >> 3.3V might be a bit better. But with my light usage, I don't see any >> stability issues. > > > Right, I guess 3V is used to safe battery, which makes sense (in tablets / > phones) > > As said I'll make this configurable making 3V the default and set 3V3 > in the defconfig where the original firmware does that. Thanks! ChenYu _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
