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https://issues.apache.org/jira/browse/MYNEWT-523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15783859#comment-15783859
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Marko Kiiskila commented on MYNEWT-523:
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Next I'll take a look at what's going on with ECC.
Here's nrf52dk bootloader with RSA, BTW.
I haven't modified all the BSPs for optimal size, but at least this should show
how to gain some space back.
objsize
text data bss dec hex filename
15216 60 4376 19652 4cc4
/Users/marko/src2/incubator-mynewt-blinky/bin/targets/boot_nrf52/app/apps/boot/boot.elf
And here's the same without RSA:
objsize
text data bss dec hex filename
7620 56 4376 12052 2f14
/Users/marko/src/incubator-mynewt-blinky/bin/targets/boot_nrf52/app/apps/boot/boot.elf
This is starting to look better; bootloader should be < 8k.
Again, you'll need to disable the peripherals which are not needed.
targets/boot_nrf52
app=@apache-mynewt-core/apps/boot
bsp=@apache-mynewt-core/hw/bsp/nrf52dk
build_profile=optimized
syscfg=TIMER_0=0:UART_0=0
I did mention earlier that we need a different HW initialization depending on
whether bsp_init() gets called from bootloader or not. Having special target
variables might not be the optimal way to solve this. Good ideas around this
would be appreciated :)
> 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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