Jeff Epler 5eb9f9d060 atmel-samd: Fix rebooting to bootloader
Commit efbf08266b6 moved _estack in order to ensure 8-byte alignment
of the stack, but the address of _bootloader_dbl_tap must remain
right at the end of SRAM.

I verified by reading the source that the 4-byte-aligned address is
used for all samd21 / samd51 boards in
adafruit/circuitpython@efbf08266b.  However, I only tested on
trinket_m0.

Closes: #739
2018-04-03 21:40:10 -05:00
..
2018-03-23 09:34:02 -07:00