From mboxrd@z Thu Jan  1 00:00:00 1970
From: Faiz Abbas <faiz_abbas@ti.com>
Date: Fri, 11 May 2018 17:42:42 +0530
Subject: [U-Boot] Beaglebone Black U-boot won't buid - THUMB instruction
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Hi John,

On Friday 11 May 2018 07:10 AM, John Babrick wrote:
> Hello - I am trying to work through the book "Mastering Embedded Linux
> Programming" by Chris Simmonds, and trying to work through building u-boot
> after having built the cross toolchain. I am running into an error when I
> try to build u-boot, any ideas?
> 
> johann at mars:~/uboot-work/u-boot$ make
> CROSS_COMPILE=arm-cortex_a8-linux-gnueabihf- am335x_evm_defconfig
> #

The correct cross compiler is arm-linux-gnueabihf-. I'm not sure about
yours. Also, you should give ARCH=arm option in your build.

Check here for more details:
https://elinux.org/Building_for_BeagleBone

Thanks,
Faiz