Linux/AM3352: TFTP boot

Subramanya Musale

Part Number: AM3352

Tool/software: Linux

Hi All,

Please help me in board-bring up for customized am3352 processor. I want to boot kernel from DDR2 which has 256MB size start adddress 0x80000000 to 0x90000000. Please let us know how to boot with DDR instead of from NOR flash. I dont want to boot or store images in NOR flash. Just for testing

Built uImage with make LOADADDR=0x82000000 uImage .Generated uImage and followed following step.

a. flashed SPL image got window uboot#

b. uboot# tftp 0x80000000 u-boot.bin

c. uboot# tftp 0x82000000 uImage

d. uboot# tftp 0x90000000 am335x.dtb

e. uboot# tftp 0x84080000 initrd.uboot(filesystem)

f. uboot# bootm 0x82000000 0x84080000 0x90000000

Also tried without initrd.uboot bootm 0x82000000-0x90000000

After following above step kernel struct at "starting Kernel ...."

Kernel version 3.14 and 4.14 but it boots perfectly from NOR flash by storing images in NOR flash.

Please help me to boot Kernel from DDR directly also i have zImage also.

Waiting for your response.

Thanks and Regards

Subramanya

over 6 years ago

0 Krunal Bhargav34 over 6 years ago

TI__Mastermind 44965 points

Hello Subramanya,

I am wondering if SD card boot is an option on your board setup. With regards to Network boot, please refer to the following TI guide.

Regards,
Krunal

0 Subramanya Musale over 6 years ago in reply to Krunal Bhargav34

Intellectual 430 points

Hi Krunal,

There is no sd card boot option in my board. We have NOR flash option. But my question is how to boot device from DDR directly instead from loading images from flash memory. Please help me to boot from DDR directly instead of any storage device.

Regards,

Subramanya N M

0 Krunal Bhargav34 over 6 years ago in reply to Subramanya Musale

TI__Mastermind 44965 points

Hello Subramanya,

You cannot boot from DDR because it is a volatile memory and during run time, Kernel image is copied from the boot media (ie SD/eMMC, NAND, etc) to DDR. After copying the image, Kernel is executed from DDR.

Regards,
Krunal

0 Subramanya Musale over 6 years ago in reply to Krunal Bhargav34

Intellectual 430 points

Hi Krunal,

Thanks for the reply. Yes we know that DDR is volatile memory but there is a way to execute directly from DDR. Finally after copying from flash kernel has to execute from DDR. I am trying and endup with kernel panic with ramdisk error.

Please let me know DDR partition for kernel uImage, device tree DTB and Filesystem initrd.uboot memory address for 512MB DDR.

Regards,

Subramanya

0 Krunal Bhargav34 over 6 years ago in reply to Subramanya Musale

TI__Mastermind 44965 points

Hello Subramanya,

I am wondering if you could please share your kernel boot logs. Also, initially you mentioned "Kernel version 3.14 and 4.14 but it boots perfectly from NOR flash by storing images in NOR flash" and I am not able to understand why you are getting errors now.

Regards,
Krunal

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Linux/AM3352: TFTP boot