Hi,
On 09-12-14 11:17, Chen-Yu Tsai wrote:
Hi,
On Tue, Dec 9, 2014 at 2:53 AM, Hans de Goede <hdego...@redhat.com> wrote:
Hi,
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
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.
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.
Regards,
Hans
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