<CheetahPixie>
I can't for the life of me find the UART.
<CheetahPixie>
A bunch of stuff seems to make noise, but no matter what baud I try, it never makes sense.
<CheetahPixie>
Even pads side by side fluctuate in voltage.
<KotCzarny>
you shouldnt connect random pads together
<KotCzarny>
you dont know what they are
<KotCzarny>
voltimeter should be your tool
<CheetahPixie>
I'm using its probe with a line to an UART RX, and when not doing that, to measure voltages.
<CheetahPixie>
And yes, they jump all over on multiple pads.
<CheetahPixie>
Is there no way to get at this besides uboot?
<CheetahPixie>
Including booting a33 dtb images from other platforms with nand chips
<karlp>
have you tried all the sdcard pads?
<karlp>
also, some rockchip (iirc?) have put them on usb pads...
<karlp>
I had a broadcom device where I needed to move 0-ohm resistors to get them to appear on pads, but that at least had obvious pads, even if you needed to rejumper
<karlp>
do you get any usb devies if you try holding the buttons down on power up?
<KotCzarny>
he has a64 tablet
<karlp>
yeah, I was looking at the picture from earlier
<KotCzarny>
so quite a new thing regarding wiki
<KotCzarny>
it might be even on audio jack
matthias_bgg_ has joined #linux-sunxi
s3b0 has quit [Quit: Konversation terminated!]
matthias_bgg has quit [Ping timeout: 264 seconds]
<CheetahPixie>
karlp vol up goes to recovery
s3b0 has joined #linux-sunxi
<CheetahPixie>
and the headphone jack has five exposed contacts... hmm
<CheetahPixie>
guess there might be something there?
<KotCzarny>
who knows, grab multimeter and observe what happens there during device power-on
dddddd has joined #linux-sunxi
<karlp>
5 is "normal" for one with plug detection switches, but yeah, you could easily find a serial port there, possibly even a button in the back of it.
andy25225 has quit [Ping timeout: 264 seconds]
<CheetahPixie>
nope, nothing on the headset jack
<CheetahPixie>
one of the sunk-in sd pads reacts consistently to device reset
<CheetahPixie>
this has a pc style reset switch
<KotCzarny>
is it short or constant activity?
andy25225 has joined #linux-sunxi
<CheetahPixie>
Short.
<CheetahPixie>
But 460800 baud returns a chain of lowercase xes
<CheetahPixie>
oh, whoops
<CheetahPixie>
sorry
<CheetahPixie>
but yes, short
<CheetahPixie>
i'm just stumped where it could be
<CheetahPixie>
what is the typical baudrate for uboot anyway?
<KotCzarny>
115200
<CheetahPixie>
okay
<CheetahPixie>
you say the script bit is scrambled specifically by uboot?
<CheetahPixie>
is there no way to undo this without uboot?
<KotCzarny>
it might be under that metal shield too
<CheetahPixie>
i checked, there's no pads whatsoever
<KotCzarny>
got a pic without the shield?
<CheetahPixie>
later i will
<CheetahPixie>
i'm tired and have been up all night trying to figure this out
s3b0 has quit [Quit: Konversation terminated!]
<KotCzarny>
thing is, nand is a special snowflake
<KotCzarny>
legacy uboot has the support for it, same for the kernel (but differs when it comes to scrambling)
<KotCzarny>
so you cant read uboot's area with legacy nor mainline linux, and vice versa
<KotCzarny>
when i was hacking my A13 device, i had to play tricks by copying parts of nand to mem, rebooting (while mem contents were preserved) and working from there
<KotCzarny>
you cant easily grab memory in android too because of lacking /dev/mem
<KotCzarny>
try getting firmware image from vendor
<KotCzarny>
which could be useful if you ever break the filesystem :)
<KotCzarny>
btw. did you check those points near the bottom microusb?
<CheetahPixie>
the oem completely refuses to provide the fw image
<CheetahPixie>
aren't those points ground for the shield...?
<KotCzarny>
im talking above those a bit higher, where there is space for 0resistors
<KotCzarny>
not microsd, but microusb port on the bottom
<KotCzarny>
there are 3 unpopulated jumpers
andy25225 has quit [Ping timeout: 265 seconds]
<CheetahPixie>
nope
<CheetahPixie>
none of those pads seem to respond to resets at 11520
<CheetahPixie>
0
andy25225 has joined #linux-sunxi
<KotCzarny>
you can also try asking MoeIcenowy if she had any experience with similar board
<CheetahPixie>
and who is she?
<karlp>
a nick in this channel
<CheetahPixie>
alright
aloo_shu has joined #linux-sunxi
<CheetahPixie>
would fex mode be useful at all here?
<KotCzarny>
you will get all pin-configs
<KotCzarny>
unless you ask about fel-mode
<CheetahPixie>
as in, to get at the script thing
<CheetahPixie>
and why did they remove /dev/mem from 3.10?