Linux/TDA2LF: latest uboot

Needhu Gunasegaran

Part Number: TDA2LF

Tool/software: Linux

Team,

Please findthe question below from my customer working on TDA2LF.

I would like to request the newest „uboot“.
My problem: I’ not able to change the Pin multiplexing, because devicetree support seems to be broken In my 2016.5 Version.

This uboot works well on TDA2PLUS EVM… and we got the same processor package, but after changing the pinmux details, some strange things happen. I’m not able to change u-boot console to UART2 or UART3, on Pins E22, D22 resp. C22 and F20:

Therefor I changed the entries in mux_data.h of the board file and in the devicetree file and set the console_idex to 2 (experimental: to 3)… nothing works.

Evan if I change the UART-recommended “PULLUP”- resistors on the RX/TX Pins to PULLDOWN, only one Pin comes down, the other stays high and we do not use any external resistors. Strange behavior! (changed twice: deeply embedded in board-file AND in the FDT-File).

So I would like to prevent uboot from using DT-stuff… after that uboot do not build. It’s broken without DT-Support ebabled.
Do you have a newer u-boot version for me? (Mine is 2016.5 – latest, taken out of the tda2plus-vision sdk, which is public accessible).

Thank you. Looking forward for your reply.

-Needhu

over 6 years ago

0 Stanislav Stilyanov over 6 years ago

TI__Genius 15120 points

Hi Needhu,

I'm sorry I'm not able to answer the whole query, I just noticed that enabling pull-down resistors will not necessary lead to logic-low readings.

I mean, if UART is selected as peripheral on those 2 pins, then the RX pin will do read low, but TX has an active driver in UART itself, and because UART idle state is high, then it is absolutely normal to see high readings I.e. TX driver will override any pull-ups/pull-downs on the pin.

Regards,

Stan

0 Yordan Kamenov over 6 years ago in reply to Stanislav Stilyanov

TI__Mastermind 42515 points

Hi Needhu,

the U-boot, used in PSDKLA and VisionSDK is taken from here:
git.omapzoom.org/.../

I see that there is a version 2017.01, but I am not sure how much differences it has compared to 2016.05.

Regards,
Yordan

0 Needhu Gunasegaran over 6 years ago in reply to Yordan Kamenov

TI__Intellectual 2710 points

Yordan, Stan,

Thank you very much for the quick reply.

-Needhu

0 Needhu Gunasegaran over 6 years ago in reply to Needhu Gunasegaran

TI__Intellectual 2710 points

Team,

The customer mentioned that the uboot is not functional after checkout and at least the 'configs' directory is missing.

Do you have a feedback here?

Thank you.

0 Yordan Kamenov over 6 years ago in reply to Needhu Gunasegaran

TI__Mastermind 42515 points

Hi Needhu,

I have forwarded your question to U-boot expert.

Regards,
Yordan

0 Needhu Gunasegaran over 6 years ago in reply to Yordan Kamenov

TI__Intellectual 2710 points

Thanks Yordan,

Looking forward to hearing from Sriram.

Best,
-Needhu

0 Nikhil Devshatwar over 6 years ago in reply to Needhu Gunasegaran

TI__Genius 9905 points

Hi Needhu,

Are you facing the issue for first stage u-boot or the second stage u-boot.
Because, only the 2nd stage u-boot uses the DT.

Also, all the pinmux config is done only from the first stage. If you see prints coming on the different UART from first stage, that will confirm your changes being correct from pinmux perspective.

Also, TI always recommend to use official release packages for Linux, u-boot, filesystem combination.
Do not take the latest tree, it may not be compatible with other SW components.

Regards,
Nikhil D

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Linux/TDA2LF: latest uboot