SAM4S16- consistently fails to verify

[dngbionics]

Just built on Ubuntu 18.04 using the latest master (commit 820207).

All written pages fail to verify successfully.

Also note that the 'info' command seems to take unnecessarily long to process (about 5 seconds).

What can I do to help diagnose this issue?

bossa> connect /dev/ttyUSB2
Connected to device on /dev/ttyUSB2
bossa> info
Locked : none
Security : false
Boot Flash : false
bossa> erase
Erase flash
Flash is erased
bossa> write ../test.bin
Write 75032 bytes to flash (147 pages)
[==============================] 100% (147/147 pages)
Write successful
bossa> verify ../test.bin
Verify 75032 bytes of flash
[==============================] 100% (147/147 pages)
Verify failed
Page errors: 147
Byte errors: 74640

[dngbionics]

Just tested with Release 1.9.1 and got exactly the same result. :`(

[dngbionics]

Reading back the flash contents shows the flash was still completely erased:
bossa> read ../out.hex
count:0 offset:0
Read 1048576 bytes from flash
[==============================] 100% (2048/2048 pages)
Read successful

$ hexdump ./out.bin
0000000 ffff ffff ffff ffff ffff ffff ffff ffff
*
0100000

[dngbionics]

Hmmm...after more attempts my Writes are now failing consistently at 22% (no hardware or software changes made):

bossa> write ../test.bin
Write 75032 bytes to flash (147 pages)
[====== ] 22% (33/147 pages)
Flash command failed.

Reads however are still working, and still show the flash is full of FFs even after the writes.

[Gadgeteering]

I think this is the same problem that I have had ( #108 ) the S16 has 8k of ram and Bossa Starr writing to the middle of the ram and overflows into the stack. The boot loader then crashes. The write buffer needs to be reduced see pull requests #110

[haata]

As a side note, I believe I have one dead ATSAM4S4B chip (was powered at around 4.2V for a while due to a pcb screwup). SAM-BA can attempt a write, but verifies tend to fail (other boards, which were always powered correctly, with some rework, work just fine).

[adityathakekar]

I have same issue with SAMD21E18A, is this closed in another thread?