Loading u-boot.img over UART

Anatoly Goldstein

Other Parts Discussed in Thread: AM3874, AM3871

Hi all.

We are developing a device based on AM3874 processor.

Currently I'm trying to boot it over UART.

I'm working according to a procedure described in TIs wiki Linux Core U-Boot User's Guide processors.wiki.ti.com/.../Linux_Core_U-Boot_User%27s_Guide

I can see 'C' on UART, so processors ROM is executing.

I can successfully send u-boot-spl.bin with XMODEM.

But when I try to send u-boot.img with YMODEM I get Retry 0: NAK on sector .

Can anyone help me on that?

Thanks,

Anatoly

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Moving this to the AM387X forum.

0 Pavel Botev over 10 years ago

TI__Guru**** 170625 points

Hi Anatoly,

The correct wiki for AM387x u-boot is:
processors.wiki.ti.com/index.php

You have u-boot.min.uart and u-boot.bin files.

See also:
e2e.ti.com/.../997063

Regards,
Pavel

0 Anatoly Goldstein over 10 years ago in reply to Pavel Botev

Intellectual 530 points

Hi, Pavel,

Thanks for a quick reply.

The wiki page you suggested to look at seems to be outdated or it refers to an old u-boot version.

I'm using u-boot-2014.10 and it has no such configs as described in this wiki and file u-boot.min.uart is not created.

Meanwhile I made some changes in DDR configurations and after that I succeeded to load u-boot.img, however u-boot didn't start, I see no response on UART console.

I'll appreciate any help on this.

Thanks,

Anatoly

0 Pavel Botev over 10 years ago in reply to Anatoly Goldstein

TI__Guru**** 170625 points

Anatoly,

The wiki page is up to date for TI81xx devices (DM81xx, AM387x, AM389x). AM387x device is using u-boot-omap3:

arago-project.org/.../projects;a=shortlog;h=refs/heads/ti81xx-master

The last EZSDK for AM387x device is 5.04.00.11 and it comes with u-boot-2010.06:

ti-ezsdk_dm814x-evm_5_04_00_11/board-support/u-boot-2010.06-psp04.04.00.01

www.ti.com/.../toolssoftware

www.ti.com/.../linuxezsdk-sitara -> Linux EZ SDK for AM3871, AM3872, AM3874

software-dl.ti.com/.../index_FDS.html

Regards,
Pavel

0 Pavel Botev over 10 years ago in reply to Anatoly Goldstein

TI__Guru**** 170625 points

Anatoly Goldstein said:
I'm using u-boot-2014.10

This u-boot is for newer TI devices (newer than AM3874).

Regards,
Pavel

0 Anatoly Goldstein over 10 years ago in reply to Pavel Botev

Intellectual 530 points

Thanks Pavel.
I'll check an older u-boot version. I actually expected that newer version will have backward compatibility for older processors.
I also found configuration file for TI814x_evm in u-boot-2014.10.
Any way, I'll leave this thread opened while checking u-boot-2010.06, since I might have some additional questions.

Anatoly

0 Pavel Botev over 10 years ago in reply to Anatoly Goldstein

TI__Guru**** 170625 points

Anatoly,

U-Boot v2014.x is for AM335x, AM43xx, DRA7x devices, but not for AM387x/TI814x devices. It might work with AM387x device also, but it will require some porting efforts, it won't work as it is.

BR
Pavel

0 Anatoly Goldstein over 10 years ago in reply to Pavel Botev

Intellectual 530 points

Well, I tried u-boot-2010.06 both from EZSDK 5.04.00.11 and from arago-project.org.
In both cases the result was the same, after successful sending of u-boot.min.uart over UART I didn't get first stage u-boot prompt “TI-MIN#”
and UART console didn't respond to keyboard at all.
Can you suggest a direction where to proceed from this point?

Anatoly

0 Pavel Botev over 10 years ago in reply to Anatoly Goldstein

TI__Guru**** 170625 points

Anatoly,

This might be HW issue, as you are on custom board.

See the below wiki:

processors.wiki.ti.com/index.php/Understanding_u-boot-min_startup_for_DM814x

Check if the flow stuck at the DDR init function in board/ti/ti8148/evm.c s_init()

See also:

processors.wiki.ti.com/.../_C6A814x_Schematic_Review_Checklist

processors.wiki.ti.com/.../Debug_Tips_for_DM81xx_Boot_Fail

processors.wiki.ti.com/.../AM335x_board_bringup_tips

Regards,
Pavel

0 Anatoly Goldstein over 10 years ago in reply to Pavel Botev

Intellectual 530 points

There is a problem in Makefile

ti8148_evm_config	\
ti8148_evm_config_nand	\
ti8148_evm_config_nor	\
ti8148_evm_config_spi	\
ti8148_evm_config_sd	\
ti8148_evm_min_spi	\
ti8148_evm_min_uart	\
ti8148_evm_min_nand	\
ti8148_evm_min_eth	\
ti8148_evm_min_sd:	unconfig
	@mkdir -p $(obj)include
	@echo "#define CONFIG_TI81XX"	>>$(obj)include/config.h
	@echo "#define CONFIG_TI814X"	>>$(obj)include/config.h
	@if [ "$(findstring _min_,$@)" ] ; then \
		echo "TEXT_BASE = 0x80700000" >> $(obj)board/ti/ti8148/config.tmp; \
		echo "#define CONFIG_TI814X_MIN_CONFIG"    >>$(obj)include/config.h ; \
		echo "Setting up TI8148 minimal build for 1st stage..." ; \


TEXT_BASE should be 0x40300000.

At least on my system after changing TEXT_BASE to 0x40300000 u-boot.min.uart started running without problems.

BR,
Anatoly

0 Pavel Botev over 10 years ago in reply to Anatoly Goldstein

TI__Guru**** 170625 points

Anatoly,

Anatoly Goldstein said:
TEXT_BASE should be 0x40300000.

At least on my system after changing TEXT_BASE to 0x40300000 u-boot.min.uart started running without problems.

0x80700000 is address from the DDR0 memory map. The AM387x EVM u-boot.min.uart is working fine with TEXT_BASE at 0x80700000. 0x40300000 is address from the internal OCMC SRAM. This is indication that DDR memory at your custom board is not set up correctly.

Regards,
Pavel

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Loading u-boot.img over UART