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The Amazon Tap is a wireless bluetooth & wifi speaker featuring the "Alexa" voice assistant.
Buying devices is expensive and, in a lot of cases our testing leads to bricked equipment. If you would like to help support our group, site, and research please use one of the links below to purchase your next device. Purchase the Amazon Tap at Amazon
- Freescale [MCIMX6L8DVN10AB] i.MX 6 SoloLite Applications Processor
- KMNJ2000ZM eMMC/DRAM
- Broadcom BCM4343
You can find an excellent teardown of the Amazon Tap at [ifixit.com].
The Amazon Tap features UART pads that provide u-boot boot info but no shell and kernel debug output during boot.
The UART pads can be found in the photo below.
Gaining Bootloader Shell
The Amazon Tap implements a secure boot process but a bootloader shell can be obtained by grounding the flash data0 pin while u-boot is reading the kernel into memory.
To access the bootloader shell.
- Connect to UART
- Ground resistor next to TP27 silkscreen
- u-boot shell is available when presented with "=>"
The photo below illustrates the process.