Console With U-boot

guillaumeF

Other Parts Discussed in Thread: AM3359, TMDXEVM3358

Hi,

We are working on the AM3359 IDK.

U-boot and the linux kernel are compiled like explained on wikis(http://processors.wiki.ti.com/index.php/Sitara_Linux_Software_Developer%E2%80%99s_Guide), with am335x-evm-sdk-src-05.04.01.00.tar.gz .

We create the SD card with the create-sdcard.sh script.

There are two partitions: the first one is boot, with MLO, u-boot.img and uImage files

The second one is rootfs, empty.

The SW3 and SW4 switches are configure for a SD boot.

When we switch-on the card, the Minicom window displays:

"Uncompressing Linux... done, booting the kernel"

Ok, but we don't have the u-boot shell. Do you know how to do?

Thanks a lot.

GF.

over 11 years ago

0 Anil over 11 years ago

TI__Expert 6655 points

Hi GF,

Try one more time to create SD card image, run the script one more time, rootfs should not be empty after you run the script. Don't plug out the SD card before completion.

Try to add earlyprintk to your bootargs.

After power-up, in the console you have to press enter (by default 3 sec delay is there) before kernel loads so that you can access u-boot prompt.

Regards

AnilKumar

Please mark this Forum post as answered via the Verify Answer button below if it helps answer your question. Thanks!

0 DaveB123 over 11 years ago in reply to Anil

TI__Expert 4745 points

If Root File System is not present on the SD partition, then just copy (cp rootfs.tar.gz /media/rootfs) it to the SD card partition.

Then run:

cd /media/rootfs

tar xvf rootfs.tar.gz

and then

cd /

umount /media/rootfs

0 guillaumeF over 11 years ago in reply to DaveB123

Prodigy 160 points

Thanks a lot for yours answers.

I re-try to use the create-sdcard.sh script, with the prebuild image and with my images.

I enable the printk in the menuconfig of the Linux kernel.

I press Enter before the load of the kernel.

but There is NO u-boot# prompt.

did you tried the AM3359 IDK with the pre build images?

Maybe there is some define to configure in the /include/configs/amm335x_evm.h file in the u-boot sources folder?

Thnaks a lot.

GF.

0 guillaumeF over 11 years ago in reply to guillaumeF

Prodigy 160 points

And I tried to boot in UART Mode with http://processors.wiki.ti.com/index.php/AM335x_U-Boot_User%27s_Guide#UART and http://processors.wiki.ti.com/index.php/AM335x_U-Boot_User%27s_Guide#Flashing_U-Boot_with_CCS totorials, but it's not working, there is not CCCC character on the minicom....

do have any Idea?

Thanks,

GF.

0 guillaumeF over 11 years ago in reply to guillaumeF

Prodigy 160 points

Hi,

I misunderstood something:

I am trying to work with the am3359 IDK card TMDXIDK3359. but this cad doesn't support Linux Operating support. I think it's the source of my problems.

Whereas the TMDXEVM3358 card support Linux operating system.

The problem is that in this web page http://www.ti.com/product/am3359, the comparative array displays that the am3359 processor supports Linux OS. But not the IDK with am3359 chips. Do you have plan a SKD with Linux Os for the TMDXIDK3359 card ?

But do you think that u-boot should work with the TMDXIDK3359 card ? How to build it for an am3359 architecture, and not an am335x architecture. Is it feasible?

thanks.

GF.

0 Paul Conway over 11 years ago in reply to guillaumeF

Prodigy 25 points

hi GF -

we are also attempting to bring up Linux on the TMDXIDK3359

we also are having difficulties.

did you resolve your issues?

did you get Linux to boot up on this Hardware?

thnaks,

Paul

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Console With U-boot