What does 'Undefined Ins' mean in u-boot?

[JHY]

I use i.MX28, uboot and spl.

After board_init_ll (SPL) returned, before board_init_f (uboot) executed, 'Undefined Ins' is printed out in my console and system is hanging.

I can not find 'Undefined Ins' in uboot or spl source.

What is it executed between SPL and uboot.

[fabio_estevam]

Also, I've seen cases where 'Undefined Ins' was caused when the wrong toolchain was used: for example - using a toolchain for armv7 (mx6) to build code for arm926 (mx28). Make sure you have a suitable toolchain for mx28.

[JerryFan · Accepted solution]

It is likely that the "Undefined Instruction" been printed by ROM code. And ROM code should print "r14_undef" and followed with LR value which points the place where the exception occurred. Do you see these ever?

B.R
Jerry

[fabio_estevam]

Please make sure you follow the procedures below:

http://git.denx.de/?p=u-boot.git;a=blob;f=doc/README.mxs;h=ed2e5688562ac1af55a7c6213f5f3eb825e055b8;...

and

http://git.denx.de/?p=u-boot.git;a=blob;f=board/freescale/mx28evk/README;h=958ebc679106a52810506c506...

[SergioSolis]

Please take a look at this past thread, it might be able to help you:

iMX28evk u-boot sd-card -> Undefined Ins