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https://issues.apache.org/jira/browse/MYNEWT-523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15783779#comment-15783779
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Marko Kiiskila commented on MYNEWT-523:
---------------------------------------
Here's some immediate help.
Bootloader builds include a lot of things which are actually not used. I made
some changes to give ability to exclude some of the bigger items from there.
Here's my target for building bootloader with RSA for nrf51 blenano:
targets/boot_nrf51_blenano
app=@apache-mynewt-core/apps/boot
bsp=@apache-mynewt-core/hw/bsp/nrf51-blenano
build_profile=optimized
syscfg=TIMER_0=0:UART_0=0
And this the size then:
Size of Application Image: app
FLASH RAM
35 192 *fill*
94 0 apps_boot.a
2933 4004 boot_bootutil.a
72 0 boot_nrf51_blenano-sysinit-app.a
128 0 crt0.o
8 0 crti.o
16 0 crtn.o
7668 0 crypto_mbedtls.a
386 444 hw_bsp_nrf51-blenano.a
32 0 hw_cmsis-core.a
384 0 hw_hal.a
698 0 hw_mcu_nordic_nrf51xxx.a
441 24 kernel_os.a
470 32 libc_baselibc.a
72 0 libg.a
1680 0 libgcc.a
282 4 mypkgs_rsa_key.a
539 128 sys_flash_map.a
314 12 sys_mfg.a
objsize
text data bss dec hex filename
16252 56 4352 20660 50b4
/Users/marko/src2/incubator-mynewt-blinky/bin/targets/boot_nrf51_blenano/app/apps/boot/boot.elf
> boot - boot loader with BOOTUTIL_SIGN_RSA/EC is too large
> ---------------------------------------------------------
>
> Key: MYNEWT-523
> URL: https://issues.apache.org/jira/browse/MYNEWT-523
> Project: Mynewt
> Issue Type: Bug
> Components: Bootloader
> Affects Versions: v1_0_0_beta1
> Reporter: Simon Ratner
> Assignee: Marko Kiiskila
>
> With image signatures enabled, boot loader weighs in at ~27kB, which is too
> big for both the nrf51 and nrf52. Even disabling most of mbedtls and only
> keeping minimum required features comes to 25kB(EC) / 20kB(RSA).
> Without signature support, boot loader is ~12kB.
> Maybe consider secp256r1 with tinycrypt as an option for smaller footprint?
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