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OK, I've got a functional serial connection, when i interrupt the boot sequence it runs into a loop showing "Enter fastboot mode, use Ctrl+C to exit" and the only input that has any effect is Ctrl-C which simply echos the "Enter fastboot mode ...." line again.
The Kindle USB port shows up on my Windows 7 machine as a "USB Download gadget" but I have not been able to find a driver for it on my PC.
any ideas on how to proceed would be gratefully received.
Console output as follows :
[ 583.335857] reboot: Restarting system
HW
U-Boot 2016.03 (Oct 12 2018 - 17:30:31 -0700)
CPU: Freescale i.MX6SLL rev1.1 996 MHz (running at 792 MHz)
CPU: Commercial temperature grade (0C to 95C) at 42C
Reset cause: POR
Board: MX6SLL Rex
I2C: ready
DRAM: 512 MiB
entering PMIC test mode
in PMIC test mode -- apply bootup workaround
switching back to PMIC user mode
setup_pmic_mode -- make sure pmic is in user mode
MMC: FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2
idme_initialize
Idme version is 2.x and set related function to V2.x
IDME table version 2.1
hibernation: Not from hibernation
Core : f770ee83 2018/03/16 19:49:02 (Licensed to Amazon Fulfillment Services,Inc..)
SBIOS: v2.0 2018/11/27 03:26:04
TTBR:9fffc059
Platform: v2.0 2018/11/27 03:26:04
fl
*** Warning - bad CRC, using default environment
In: serial
Out: serial
Err: serial
Hardware Board: Unknown(12)
Board ID is P001F209835503C9
WFO module
secure_cpu: 1, production: 1, unlocked: 0
Boot mode is 0
Hit any key to stop autoboot: 0
Enter fastboot mode, use Ctrl+C to exit.
Enter fastboot mode, use Ctrl+C to exit.
Enter fastboot mode, use Ctrl+C to exit.
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