EJTAG on SMP

From t-hack.com - Hack X300T / X301T

The SMP 8634 is a chip in Ball-Grid-Array casing. This is a problem when the developer of a SMP based device did not wire up the eJTAG port on purpose.

Recently our community member Bitbucket discovered that there are test-traces for the eJTAG pins accessible from the upper side of the chip.

the JTAG-Enable pin has to be wired to 3.3V to enable the JTAG port.

if you have a device other than the x300t and managed to enable the eJTAG port.... feel free to contact us :)