Hey there @CHKDSK88: I absolutely will post if I manage to get a dump.
As for replacing the stock firmware: I have no sources for firmware images, and no device-tree with which to build a replacement OpenWrt initramfs (though I could make some educated guesses).
Addendum: If I can't get a root shell with the existing firmware, I can instead, as per @danitool, build barebox for the board and use his copy of some Buffalo Linkstation u-boots to source the RAM training program. Regarding building barebox, he suggests building the OpenWrt mvebu toolchain and then using the following exports to build barebox:
# hurricos: these were my exports for barebox (found in my notes)
export CROSS_COMPILE=/usr/bin/arm-linux-gnueabihf-
export KBUILD_OUTPUT=../build
export ARCH=arm
make mvebu_defconfig
export STAGING_DIR=/run/media/dani/DT01ACA3/OPENWRT/snapshot-linkstation/staging_dir
make
# well this has no much sense to me right now
# btw compiling barebox it's easy once you give it the path of the right toolchain
One more thing to add: @hmartin provided a Dockerfile to build Marvell Armada u-boot: this might not support Armada 370 (I believe this u-boot release is after u-boot-marvell purged stuff for the Armada 370), but it'd be worth a shot if we want to rebuild U-boot from scratch and set up a new board definition for build.pl -- or if CTERA ever releases u-boot sources.