AM335 Kernel 3.12 Software UART

michael musset

HI,

I would like to know if it is complicate to port the software uart driver to the kernel 3.12 or 3.8 ?

I tried to do it, by copying the folder drivers/tty/serial/am335x_pru_suart

But when I start to build the kernel I got :

drivers/tty/serial/am335x_pru_suart/am335x_suart_board.h:22:34: fatal error: linux/mfd/pruss_core.h: No such file or directory
compilation terminated.
make[4]: *** [drivers/tty/serial/am335x_pru_suart/suart_api.o] Error 1
make[3]: *** [drivers/tty/serial/am335x_pru_suart] Error 2
make[2]: *** [drivers/tty/serial] Error 2
make[1]: *** [drivers/tty] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [drivers] Error 2

What do you think ?

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Hi Michael,

PRU code cannot be built directly in the kernel. It uses the PRU core, which has its own instruction set. It must be built separately and then Linux can load the firmware in the PRU.

0 michael musset over 10 years ago in reply to Biser Gatchev-XID

Expert 1135 points

Ok, but why here, there is an example of building the kernel with the firmware ?

http://processors.wiki.ti.com/index.php/Soft-UART_Implementation_on_AM335X_PRU_-_Software_Users_Guide

0 michael musset over 10 years ago in reply to michael musset

Expert 1135 points

look :

Enabling AM335x PRU based SUART driver within menuconfig

Device Drivers ---> Character devices ---> Serial drivers ---> PRU based SUART emulation

0 Biser Gatchev-XID over 10 years ago in reply to michael musset

TI__Guru**** 393215 points

Have you seen the note at the beginning of this wiki:

"Note: The Linux Driver is implemented on the 3.2.0 kernel. Currently there no plans to port this driver to other kernel versions."

0 michael musset over 10 years ago in reply to Biser Gatchev-XID

Expert 1135 points

I know, but i would love to port it to the kernel 3.12 if it's possible..... What do I have to do to convince TI to port it to the kernel 3.12 ?

0 Biser Gatchev-XID over 10 years ago in reply to michael musset

TI__Guru**** 393215 points

I cannot say about this. Starting with SDK 7.0 a different approach is used for PRU Linux support: http://software-dl.ti.com/sitara_linux/esd/PRU-SWPKG/latest/index_FDS.html

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AM335 Kernel 3.12 Software UART