[Lenny400] LetuxOS on SD card for MIPS JZ4780 CI20
H. Nikolaus Schaller
hns at goldelico.com
Sun Apr 14 09:32:19 CEST 2019
> Am 13.04.2019 um 22:14 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
> Hm. Yes, this one looks strange:
> Maybe my script that copies it to the server is broken... Or the old U-Boot code
> does not store a copy in .config and the script copies the last one found in
> the source tree? Yes, the file ".config" is from Feb 2019 so it was not created
> by the make process.
Yes. I have fixed it. It is newer Kconfig based U-Boot which writes .config.
Older U-Boot does not touch it if it exists from a different make run.
>> One thing which I did encounter was some confusion about which UART was being
>> used. Ultimately, I used UART0, but I do wonder if U-Boot might use another
>> UART early on.
> Yes, the eserial4 is indicative...
> But I have not changed any line of the source code (well one about endianness
> if host gcc is used).
> What could be is that I should connect to the other UART port... And U-Boot
> switches to eserial4 just after printing "Err: eserial4". Therefore the
> first message I can see on eserial4 is "Net: dm9000".
> If we dig into the U-Boot source it should be possible to find these definitions.
> And change them to our needs (stable console port...).
I have now checked with https://www.elinux.org/CI20_Hardware#Dedicated_UART_header
and my FTDI is connected to the primary expansion header:
pin 6 black GND
pin 8 white UART0_TXD
pin 10 green UART0_RXD
(nc) red USB +5V - BTW: it should be possible to connect to pin 2/4 and power the board through the FTDI USB...
So I have no UART4 connected and in use. Is this the white JST connector?
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