In testing, I used crosstool-ng-1.20 for both u-boot-2013.04 and u-boot-2015.01.
In both cases only the MLO and u-boot.img file are present in the boot sector. No other files are present.

The results of the 2 tests are below


U-Boot # 
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$U
@
@
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@
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U-Boot SPL 2013.04 (Jan 16 2015 - 09:51:10)
OMAP SD/MMC: 0
reading u-boot.img
reading u-boot.img


U-Boot 2013.04 (Jan 16 2015 - 09:51:10)

OMAP36XX/37XX-GP ES1.2, CPU-OPP2, L3-165MHz, Max CPU Clock 1 Ghz
IGEPv2 + LPDDR/NAND
I2C: ready
DRAM: 512 MiB
NAND: 512 MiB
MMC: OMAP SD/MMC: 0
In: serial
Out: serial
Err: serial
Die ID #3c4a00029ff80000015913d80601800f
Net: smc911x-0
Hit any key to stop autoboot: 0
.... I stopped the boot process.....


U-Boot # 
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$U
@
@
���
@

U-Boot SPL 2015.01 (Jan 16 2015 - 10:51:48)
SPL: Please implement spl_start_uboot() for your board
SPL: Direct Linux boot not active!
reading u-boot.img
reading u-boot.img
....It hangs here.....


I am trying to upgrade/update the most recent versions of software for my igepv2. I tried both u-boot-2015.01 and u-boot-2015.01.rc3 but both give the same error. This is not critical. I can use u-boot-2013.04, I was just curious why u-boot-2015.01 doesn't work - I am obviously missing something. Linux Kernel from linux-omap-2.6.37-6 to 3.18.3? is my next attempt.


Thanks!!
Peter