<janhenrik_>
Hey, any Sochip S3 experts here? :) I ran into a (documentation) problem. I would like to use the I2S interface mentioned in the datasheet. Usual/Required pins for I2S are: BCLK LRCK SDO[3:0] SDI. Those are mentioned on page 344 in the I2S/PCM block diagram, however that is the only occurance. As physical I2S pins the Datasheet lists PCM_DIN (SDI?), PCM_DOUT (SDO?), PCM_BCLK (BCLK?) and PCM_SYNC. What am I missing? Does the S3
<janhenrik_>
not feature a full I2S interface (as in the A13 does but it is not broken out on the S3) or are pins names missing in the documentation? Or is PCM_SYNC simply LRCK and there is only one SDO?
<janhenrik_>
"(as in the A13 does but it is not broken out on the S3)" huh, i recon that the S3 was based on the A13, but I cannot find the source or any information anymore, so nevermind this statement
<apritzel>
smaeul: ah, nice one, many thanks!
<smaeul>
... and now I know why people complain about the OpenSSL C API :). but it can (almost) do the certificate generation, so I'll give it a pass
<smaeul>
apritzel: any ideas about what to do for the SPL header? throw it inside the firmware item? between the headers and the first item? use the existing format or something new?
<smaeul>
the problem with wrapping eGON inside TOC0 is that it gets padded twice. otherwise it fits in 32k still
<apritzel>
smaeul: haven't thought about that too hard, but wasn't the embedded eGON just something which made the conversion script easier? Do we actually really need this?
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<apritzel>
now that we have proper mkimage support, why do we need eGON? I mean if the magic reads TOC0, we just can use different code (or just a different offset) to get what we want?
<smaeul>
apritzel: no, we don't need embedded eGON. the changes I pushed are all that's needed to boot. but it breaks DT selection because we lose the extra SPL header stuff
<apritzel>
smaeul: ... which is something we invented, and guarded by the eGON magic
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<apritzel>
so I would say we have an alternative when we read TOC0
<apritzel>
or does the BROM throw away all the TOC0 headers?
<smaeul>
it doesn't throw away anything, no. unless you choose a load address that overwrites them, they will be left at the start of SRAM A1
<smaeul>
but anything we put there isn't signed. only the items themselves are signed
<smaeul>
there are a couple hundred free bytes in the key item, and we can make the certificate arbitrarily large
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<smaeul>
bauen1 wants to rearrange the headers so that the firmware item actually starts before its item header, so the load address is also signed
<apritzel>
smaeul: does it work on the A64? I need to play with it to understand it better (but not today anymore)
<smaeul>
apritzel: uh, just H6 at the moment. I'll investigate and fix H5 compatibility (that should be equivalent to A64, I don't have any secure A64 devices)
<smaeul>
I hoped it would Just Work, but apparently there's some difference between the SBROMs
<yoq>
janhenrik_: afaik other allwinner chips have the same 4 pin (single data line) interface for I2S. the S3 peripheral looks pretty similar to the one on the H3 which has been usable for quite some time. frame sync = word select = L/R clock, just different names for the same thing
<apritzel>
smaeul: if you don't have time, I can try to work it out. I have one secure H64 (Remix Mini) and one secure Pine64, so both are A64
<janhenrik_>
thanks yoq! I just found AN12202 by NXP stating "Word Select (WS), Frame Sync (FS) or Word clock (WCLK) indicates the channel being
<apritzel>
smaeul: but having some version of TOC0 mkimage is a huge step forward, many thanks for that!
<janhenrik_>
Thanks, much cleaner :3
<janhenrik_>
It seems that Allwinner generally likes to call "LRCLK" "SYNC", quite confusing.
<janhenrik_>
Another question, Datasheet does not specify which TWI interface to use for setup. I assume both work and can be selected in the device tree
<janhenrik_>
But yay! Got scared there for a seccond, I am working on an Open Source Chromecast audio alternative/alike based on the S3 + SSM2603 and I drew the audio part at last ^^
<smaeul>
apritzel: you're welcome, it was quite an interesting exercise
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<bauen1>
smaeul: nice work
<bauen1>
smaeul: toc0 previous to H6 lacks the 0x10303 item (but should ignore it just fine) and compares the sha256 of the 0x10101 cert to the sid efuse rotpk hash
<bauen1>
so it might be possible to generate toc0 that works for both H6 and pre-H6 ; you just need to figure out the correct rotpk hash
<bauen1>
but not possible anymore if using the method that includes the items / header in the signature since the run address varies between pre-H6 ; H6
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<hexdump0815>
i did play around a bit with a h313 and a h616 tv box running the 4.9 bsp kernel from the opi zero 2 with an adjusted dtb and it looks like those socs have quite a bit headroom
<hexdump0815>
the h313 runs stable up to 1.7ghz and the h616 up to 1.8ghz (did not test any higher yet) and the temperature is still around 80 c celsius under full load in the box without any extra cooling
<hexdump0815>
does anyone know any more detail about the process this soc is produced in? according to what i found its 28nm but from the thermals it looks very similar to the amlogic s905x2 also going up to 1.8ghz with ok temperature which is 12nm for the cpu cores and 28nm for the gpu as far as i know - maybe the h313/h616 is similar?
<hexdump0815>
ok that was too quick - looks like i see thermal throttling now on the h616 which does not seem to be exposed via cpufreq values, i.e. there it still shows 1.8ghz but performance drops to about 50-60% which looks more like a h6 :)
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<hexdump0815>
sorry, my fault again: it is really running thermally stable - what pushed the performance down was not thermal throttling but the firefox with about 20 tabs which i started in parallel to increase the memory pressure a bit :) ... so looks like this is a pretty nice soc actually
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<sunshavi>
mmm. firefox on h3 jus support 4 tabs
<hexdump0815>
sunshavi: i think its just a matter of memory and maybe patience to get even more out of a h3 :)
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<sunshavi>
hexdump0815: javascript is very demanding. BTW. amazon gives the mobile version to firefox. also google gives the mobile version to firefox
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