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shumatech / BOSSA

BOSSA is a flash programming utility for Atmel's SAM family of flash-based ARM microcontrollers. The motivation behind BOSSA is to create a simple, easy-to-use, open source utility to replace Atmel's SAM-BA software. BOSSA is an acronym for Basic Open Source SAM-BA Application to reflect that goal.

Home Page:http://www.shumatech.com/web/products/bossa

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Overwrite Bootloader

Gadgeteering opened this issue · comments

commented

When I try to write a file without setting the offset (in OSX) the bootloader is corrupted and the board does not response any more.

With -o Offset at 0x2000

bossac -o 0X2000 -i -d --port=cu.usbmodem14201 -U -i -e -w -v sketch_sep15a.ino.bin -R
Set binary mode
version()=v2.0 [Arduino:XYZ] Sep 15 2019 08:29:47
Connected at 921600 baud
readWord(addr=0)=0x20001ffc
readWord(addr=0xe000ed00)=0x410cc601
readWord(addr=0x41002018)=0x1001031e
write(addr=0x20001000,size=0x34)
writeWord(addr=0x20001030,value=0x10)
writeWord(addr=0x20001020,value=0x20002000)
version()=v2.0 [Arduino:XYZ] Sep 15 2019 08:29:47
Device : ATSAMR21x16
Version : v2.0 [Arduino:XYZ] Sep 15 2019 08:29:47
Address : 0x0
Pages : 1024
Page Size : 64 bytes
Total Size : 64KB
Planes : 1
Lock Regions : 16
Locked : none
Security : false
BOD : true
BOR : true
Erase flash
chipErase(addr=0x2000)

Done in 0.190 seconds
Write 3800 bytes to flash (60 pages)
[ ] 0% (0/60 pages)write(addr=0x20001034,size=0xf00)
writeBuffer(scr_addr=0x20001034, dst_addr=0x2000, size=0xf00)
[==============================] 100% (60/60 pages)
Done in 0.023 seconds

Without -o Offset

bossac -i -d --port=cu.usbmodem14201 -U -i -e -w -v sketch_sep15a.ino.bin -R
Set binary mode
version()=v2.0 [Arduino:XYZ] Sep 15 2019 08:29:47
Connected at 921600 baud
readWord(addr=0)=0x20001ffc
readWord(addr=0xe000ed00)=0x410cc601
readWord(addr=0x41002018)=0x1001031e
write(addr=0x20001000,size=0x34)
writeWord(addr=0x20001030,value=0x10)
writeWord(addr=0x20001020,value=0x20002000)
version()=v2.0 [Arduino:XYZ] Sep 15 2019 08:29:47
readWord(addr=0x41004018)=0
readByte(addr=0x804001)=0xc7
readByte(addr=0x804001)=0xc7
readByte(addr=0x804006)=0xff
readByte(addr=0x804007)=0xff
Device : ATSAMR21x16
Version : v2.0 [Arduino:XYZ] Sep 15 2019 08:29:47
Address : 0x0
Pages : 1024
Page Size : 64 bytes
Total Size : 64KB
Planes : 1
Lock Regions : 16
Locked : none
Security : false
BOD : true
BOR : true
Erase flash
chipErase(addr=0)

Done in 5.002 seconds
Write 3800 bytes to flash (60 pages)
[ ] 0% (0/60 pages)write(addr=0x20001034,size=0xf00)

SAM-BA operation failed

As you can see the chipErase addr=0

Has anybody else experienced the same problem

commented

If I understand it well you need to use the offset to preserve the bootloader.
BTW I am trying to set the offset with the GUI version on OSX. Are you successful with the GUI too?

commented

The issue is not isolated to OSX, I have tried the windows version and it has the same fault. If I set the offset to 0x2000 in windows,OSX and command line, it programs the board correctly.

It seems that the offset default settings were removed at this commit https://github.com/shumatech/BOSSA/commit/dbdd088909c57bdf9aee191720bf6c6159217e22#diff-4bc76381991166f0b7d7a4a0a9116fde
This seems to me as a backward step.

commented

Duplicate issue #79