<Lightsword>
macromorgan, btw did you make any progress with those h616 patches?
<macromorgan>
for the PWM? yes, I haven't posted it yet but I will tomorrow.
<Lightsword>
macromorgan, have it up on git? I can give it a test if you want
<macromorgan>
the thing that was messing me up was mostly because I had the wrong PWM pin
<macromorgan>
no, I haven't put it together yet, I will do that tomorrow.
<macromorgan>
it'll just be the first 3 patches from the mailing list, and then 2 more patches of my own on top of that
<macromorgan>
err, 3 more patches, but still
<Lightsword>
macromorgan, ah, btw did you get bypass mode working as well? I was about to look at that again now that I got a h616 with an AC200 based phy
<macromorgan>
no, I can but I didn't (because I don't know when you should trigger bypass mode)
<macromorgan>
I mean I can always trigger bypass
<macromorgan>
it's just can != should and I don't know enough about PWM to know
<Lightsword>
macromorgan, I guess it's like when the requested output clock is the same as the input or something that one should trigger it?
<macromorgan>
still has a checkpatch.pl warning, I'll clean that up before I submit to mainline. I'm just waiting for those first three patches to get accepted
<Lightsword>
macromorgan, ah, cool, do you have it pushed to a git branch somewhere that I can pull to test?
<macromorgan>
nope, just have to download and apply those patches
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<BroderTuck>
macromorgan: s/witch/which/
<macromorgan>
typo? whoops
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<iscle>
Anybody else other than apritzel has A733?
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<BroderTuck>
iscle: I'm writing this on my T60ai tablet (using the buuiltin android...)
<iscle>
BroderTuck: nice! I have a T60Ai and a P50ai (which is the one I'm planning to use for development since it was very cheap and don't care if it breaks)
<iscle>
Have you looked for UART on yours? I've opened the P50ai and it's nowhere to be seen
<iscle>
I have internal pictures of the P50Ai in case anyone is interested
<BroderTuck>
iscle: wiki pages for both devices are welcome 😁
<iscle>
I will create one for the P50Ai which is the one I opened up
<iscle>
It's not hard and if you do it carefully it almost leaves no marks in the plastic
<iscle>
I was hoping uart was exposed in the charge-only usb port but it does not look like it is
<macromorgan>
Lightsword: make sure you set the pinctrl-0 and pinctrl-names for each pwm channel you'll use, or else it won't work
<Lightsword>
macromorgan, was previously testing with pinctrl-0 = <&pwm5_pin>; and pinctrl-names = "default"; with pwm5_pin having function = "pwm5"; and pins = "PA12";
<Lightsword>
assume that should work here as well?
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<apritzel>
iscle: thanks for creating the Wiki page!
<apritzel>
did you find any UART pads on the PCB?
<iscle>
apritzel: no problem! :) and no, there were no UART pads on the PCB, they are exposed on the SD Card slot like in other Teclast Allwinner tablets
<iscle>
I checked it with the oscilloscope, I have yet to attach the USB-Serial converter
<apritzel>
you mean like in basically all Allinne SoCs?
<iscle>
ah, probably xD I had no idea about that
<apritzel>
the big problem with that is that it blocks the SD card of course, so it's quite painful for bring up
<iscle>
yeah
<apritzel>
it's OK for FEL and first experiments, but since the P50Ai has UFS, which we have no clue about, SD card is probably the only mass storage for a while
<iscle>
true, and without the user manual it will be even harder to learn about thigs
<iscle>
true, and without the user manual it will be even harder to learn about things
<iscle>
so far I've thrown the DRAM initialization code in ghidra and it appears quite similar to others we've looked at
<iscle>
I have a ghidra server running under a private VPN, I can give access to those that want it
<apritzel>
ah, great, so "quite similar" often turned out to be major work still (like A133 is "quite similar" to H616)
<apritzel>
typically even those tablets still have some dedicated UART pins or at least pads
<iscle>
all test points in the pcb are tiny, even if they appear big in the pictures, and most of them are for UFS and DRAM
<apritzel>
but it's hard to know which they are, if boot0 muxes the UART to PortF
<iscle>
There are two test pads near the PMIC which I assume are I2C
<apritzel>
I see, that's a bummer
<iscle>
The only "normal" and accessible test point is for FEL
<iscle>
unless we can bit-bang uart on the USB1 port, i think we're stuck without SD card if we want UART
<iscle>
I bought a clone of it on Aliexpress today, I'm expecting it to arrive next week
<apritzel>
it at least allows to switch, without pulling things out completely
<apritzel>
so I managed to boot from SD, and put a 5 sec delay in the code, which gives me time to remove the SD card and switch to UART
<iscle>
Could it be possible to boot the SD Card in 2 or 3 bit mode instead of 4 bit and use Data3 to bitbang UART TX?
<iscle>
Native TX is on the CMD pin so that's out of the question, but maybe we can do the other one just for debugging and developing
<iscle>
s/CMD/CLK
<apritzel>
maybe possible, but tricky, I wouldn't know of bit banging UART in U-Boot?
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<apritzel>
but for initial development we can surely live with FEL booting for a while
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<iscle>
apritzel: do you have a dump of the original uart boot?
<apritzel>
probably, but at home, so can't access it before Sunday/Monday
<apritzel>
this AIBOX-A733A probably exposes the UART internally, so might be a better development vehicle. But don't feel like shelling out 130is USD quite yet ...
<apritzel>
iscle: probably the best hints atm regarding A733 are in the Syterkit source code
<iscle>
I had seen the AIBOX-A733A too, but it's too expensive. The P50Ai is much cheaper (probably because nobody is buying it due to the crappy screen) and has much more potential. Although, the limited UART is definitely not good for development...