crzyp3ck, that it is necessary, but is not enought.
did you connected also GND?
crzyp3ck, on my nanoneopi there are 3 usrt, but only one is configured to allow me login. the same is for your tablet, i suppose.
utente__: at that location is another pad with no name. but it won't hold tin on itself so I did attach gnd somewhere on the board.
so you have GND, TX and RX. under electrical point of view you are ok, but you must be sure that connection is configured into tablet softwar eto be debug port. electrical connection is not enought.
utente__: if I send a photo would it help. for this job do I need to reattach speaker and lcd to the main-board too?
send fot, but the matter is on confguration of the software of the tablet: if that uar is NOT set to b4e debug port, you cannot use it to log in.
send fot=send photo
maybe board check lcd/audio is missed and dont boot... not probable but possible.
i own nanopineo (H3) and orangepizero (H2). I would like to boot from SPI eeprom (final goal is to move a minimal OS all onto eeprom SPI and remove uSD).
i ask if someone is alreading work on this goal to work togheter.
yay, linux 4.10.0-rc3-next-20170113 works with usb on pine64! no mmc, no ethernet, but that's good enough for me for now...
utente__, there are several people here working on that. Stick around and they'll chime in before too long. I am following the issue and may be available to help test. Currently waiting for chips. I have an OpiZ, Opi1, and OpiPC2.
willmore, ok thanks. i still miss chips, but at least i start to look arount for info.
order from RS can arrive in 24-48hours. if you are in hurry and can pay with bllod of sons :)
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alternative is to work on armbian and srink down the distro, eliminating all is not strictly needed.
i get crazy to see there are some undreds of packages.
ordered his chips from China. It may take more than 24-48 hours. Also, tomorrow is a holiday, so no mail then anyway.
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I'm looking at the datasheet for the serial flash chips and they support a 4 bit mode for command and data which looks very SD like. Does anyone have a good understanding of the SD/eMMC interface on the allwinner chips? I'd like to see if they're compatable.
utente_, in case you read the logs of this channel, looks like the H5 SPI device claims to run at 100MHz. That could give 12.5MB/s under ideal condidtions--down hill and with the wind at your back. :)
And, nope, looks like SD is different enough that it can't be use to speak QPI. :(
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willmore: Allwinner chips support dual SPI, but I have not really tried to enable it
this may require some trial and error experiments because the documentation is far from perfect
as for the maximum SPI clock speed, it worked without corruption up to ~20MHz with my 15cm jumper wires
the current SPI clock speed default is 6MHz (it is used by both the BROM and U-Boot SPL)
when we have the SPI NOR flash chip soldered on the PCB, the maximum reliable clock speed can be probably higher
but that's already a somewhat dangerous territory
I guess, the sunxi-fel tool could try to automatically run tests with different SPI clock speeds to measure what is the safe limit
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willmore: my hint at OpenWRT was more like to copy their root file system layout
willmore: which does quite a good job with using very little flash, yet allowing to install packages and even have persistent directories
willmore: nothing magic, really, but a nice reference of how to arrange things