al@legion:~/src$ git clone https://github.com/Optiboot/optiboot.git optiboot.git
Cloning into 'optiboot.git'...
remote: Enumerating objects: 1965, done.
remote: Counting objects: 100% (240/240), done.
remote: Compressing objects: 100% (127/127), done.
remote: Total 1965 (delta 137), reused 178 (delta 86), pack-reused 1725
Receiving objects: 100% (1965/1965), 1.40 MiB | 4.93 MiB/s, done.
Resolving deltas: 100% (1048/1048), done.
al@legion:~/src$ cd optiboot.git/optiboot/bootloaders/optiboot/
al@legion:~/src/optiboot.git/optiboot/bootloaders/optiboot$ mv
optiboot_atmega328.hex optiboot_atmega328.hex.orig
al@legion:~/src/optiboot.git/optiboot/bootloaders/optiboot$ make clean
rm -rf *.o *.elf *.lst *.map *.sym *.lss *.eep *.srec *.bin *.hex *.tmp.sh
al@legion:~/src/optiboot.git/optiboot/bootloaders/optiboot$ make atmega328
avr-gcc (GCC) 5.4.0
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
BAUD RATE CHECK: Desired: 115200, Real: 117647, UBRRL = 16, Difference=2.1%
avr-gcc -g -Wall -Os -fno-split-wide-types -mrelax -mmcu=atmega328p
-DF_CPU=16000000L -DBAUD_RATE=115200 -DLED_START_FLASHES=3
-c -o optiboot.o optiboot.c
optiboot.c:429:2: warning: #warning BAUD_RATE off by greater than 2% [-Wcpp]
#warning BAUD_RATE off by greater than 2%
^
avr-gcc -g -Wall -Os -fno-split-wide-types -mrelax -mmcu=atmega328p
-DF_CPU=16000000L -DBAUD_RATE=115200 -DLED_START_FLASHES=3
-Wl,-Tlink_optiboot.ld -Wl,--relax -nostartfiles -o
optiboot_atmega328.elf optiboot.o
avr-size optiboot_atmega328.elf
text data bss dec hex filename
474 0 0 474 1da optiboot_atmega328.elf
avr-objcopy -j .text -j .data -j .version --set-section-flags
.version=alloc,load -O ihex optiboot_atmega328.elf
optiboot_atmega328.hex
avr-objdump -h -S optiboot_atmega328.elf > optiboot_atmega328.lst
rm optiboot.o
al@legion:~/src/optiboot.git/optiboot/bootloaders/optiboot$ diff -u
optiboot_atmega328.hex.orig optiboot_atmega328.hex
al@legion:~/src/optiboot.git/optiboot/bootloaders/optiboot$ cat
optiboot_atmega328.hex | awk -v FS="" '/^:027FFE00/{print $13 "."
$11}'
8.3
al@legion:~/src/optiboot.git/optiboot/bootloaders/optiboot$ cd
/usr/share/arduino/hardware/arduino/avr/bootloaders/optiboot
al@legion:/usr/share/arduino/hardware/arduino/avr/bootloaders/optiboot$
avr-size optiboot_atmega328.hex
text data bss dec hex filename
0 534 0 534 216 optiboot_atmega328.hex
al@legion:/usr/share/arduino/hardware/arduino/avr/bootloaders/optiboot$
cat optiboot_atmega328.hex | awk -v FS="" '/^:027FFE00/{print $13 "."
$11}'
4.4
My system is Debian bullseye+backports. No foreign apps.
It seems that Debian includes an ancient version of optiboot (v.4.4 of
January 2012). It is unusable because the size of the resulting
bootloader is too big. Current version (v.8.3) can be compiled with
our default toolchain and produces a hex file which has correct size
and is identical to the one on the optiboot github (see the line above
with diff).
Maybe this information will be of some use, because the current
situation with non working bootloader is quite inconvenient.
Kind regards,
Alex.
