topic No u-boot console when loaded from DDR in i.MX Processors

No u-boot console when loaded from DDR

mohamed-ali_fod — Fri, 13 Mar 2020 13:03:03 GMT

Hi,

I am using "JLinkExe -device CORTEX-A9 -JTAGConf -1,-1 -if JTAG -speed auto -CommandFile uboot.jlink"
to load the uboot to the memory (attached is the script and the uboot binary), but I am still not able to get u-boot traces from the console. The u-boot was compiled with following config:

CONFIG_BOOTDELAY=5

# CONFIG_DISABLE_CONSOLE is not set

The uboot.imx.bin was successfully loaded as mentioned below:

J-Link>mem32 0x177ff000,9
177FF000 = 402000D1 17800000 00000000 177FF42C
177FF010 = 177FF420 177FF400 00000000 00000000
177FF020 = 177FF000
J-Link>mem32 177FF42C,9
177FF42C = 00000000 00000000 00000000 00000000
177FF43C = 00000000 00000000 00000000 00000000
177FF44C = 00000000

IVT - start = 177FF000

IVT - entry = 17800000

Any idea?

Thanks.

Re: No u-boot console when loaded from DDR

igorpadykov — Sat, 14 Mar 2020 04:42:09 GMT

Hi Mohamed

reason may be that memory is not working at all, one can try

to test it with baremetal sdk test (folder /..apps..tests/ddr_test.c), debugger scripts in

../tools, "1.1.0_iMX6_Platform_SDK.zip" found on link SMP Enable in IMX6

Check signals with oscilloscope, use IMX6DQ6SDLHDG, Hardware Development Guide for i.MX 6Quad, 6Dual, 6DualLite, 6Solo Families of Applications Processors

Best regards
igor
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Re: No u-boot console when loaded from DDR

mohamed-ali_fod — Mon, 16 Mar 2020 08:22:10 GMT

Hi Igorpadykov,

Thank for you reply but I don't think that is a memory issue because I am able to write/read data correctly as I mentioned in my first post, if it was a memory issue I should not have access to the memory for write or read operations.

Before loading uboot I did the configuration of the DDR through J-link. I attached also these settings in the first post.

Best Regards,

Mohamed

Re: No u-boot console when loaded from DDR

igorpadykov — Mon, 16 Mar 2020 12:17:46 GMT

is that uboot working fine when loaded in usual way, not with jtag.

Probably it was wrongly built/configured.

First, suggest to check if correct uart port is configured for building uboot.imx.bin

mx6sabresd.h\configs\include - uboot-imx - i.MX U-Boot

#define CONFIG_MXC_UART_BASE UART1_BASE
#define CONSOLE_DEV "ttymxc0"

Best regards
igor