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https://issues.apache.org/jira/browse/MYNEWT-259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15269509#comment-15269509
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Marko Kiiskila commented on MYNEWT-259:
---------------------------------------
I don't think you have build_profile variable set.
You'll be missing key compiler cflags then. Including one that says that you're
compiling for cortex-m4.
> Bootloader for olimex_stm32-e407 won't build
> --------------------------------------------
>
> Key: MYNEWT-259
> URL: https://issues.apache.org/jira/browse/MYNEWT-259
> Project: Mynewt
> Issue Type: Bug
> Reporter: Paul Dietrich
>
> Compiling asn1parse.c
> Compiling asn1write.c
> Compiling base64.c
> Compiling bignum.c
> bignum.c: In function 'mpi_mul_hlp':
> bignum.c:1159:1: error: r7 cannot be used in asm here
> }
> ^
> Error: exit status 1
> exit status 1
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