i.MX6 u-boot.bin and JTAG

chris_c — Tue, 07 Mar 2017 19:33:21 GMT

I am trying to load u-boot onto an i.MX6DL board via JTAG without using any other peripherals (ie, USB, SD card, etc). I am using an ARM DSTREAM JTAG debugger.

In the past, I was able to do this with u-boot 2009.08 using the u-boot elf file. I would do the following:

1. Connect to board with JTAG

2. Load DDR .ds script to initialize DDR registers

3. Load the u-boot ELF file

4. Start the debugger

5. Board would boot that loaded u-boot out of memory.

However, when I try with the current version of u-boot 2016.03, DSTREAM won't even load the u-boot elf file properly. Something has changed in u-boot since 2009 and they use some ELF headers that prevents debuggers from loading the ELF file properly. So now I am trying to use the "restore" command in DSTREAM to load u-boot. The procedure I'm tying is:

1. Connect to board with JTAG

2. Load DDR .ds script to initialize DDR registers

3. Execute the following commands on debugger to load u-boot:

# disable IRQs, MMU and cache

set var $Core::$CPSR.I = 0x1
set var $Core::$CPSR.F = 0x1
set var $CP15::$SBanked::$S_SCTLR.M = 0
set var $CP15::$SBanked::$S_SCTLR.C = 0

# Load binary into memory

restore u-boot.bin binary 0x17800000

# load symbols
add-symbol-file u-boot SP:0x0

# set PC
set var $PC = 0x17800000
set debug-from *0x17800000

4. Start the debugger

5. u-boot does not start

I'm assuming NXP uses DSTREAM debuggers to do this, so if anyone can point out what I'm doing wrong I would appreciate it.

Re: i.MX6 u-boot.bin and JTAG

Yuri — Mon, 13 Mar 2017 02:29:47 GMT

Hello,

You may look at the following Community post :

How to Use Trace32 to Run U-boot in the i.MX6Q SABRE Platform

Also, I sent You document ; hope it helps.

Have a great day,

Yuri

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Re: i.MX6 u-boot.bin and JTAG

chris_c — Mon, 13 Mar 2017 13:58:57 GMT

I was able to resolve my own issue by turning off the Thumb instruction set.

topic Re: i.MX6 u-boot.bin and JTAG in i.MX Processors

i.MX6 u-boot.bin and JTAG

Re: i.MX6 u-boot.bin and JTAG

Re: i.MX6 u-boot.bin and JTAG