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Add ChangeLog and migration guide for MBEDTLS_ECP_FIXED_POINT_OPTIM

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Signed-off-by: kXuan <kxuanobj@gmail.com>
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kXuan 2021-06-01 11:36:18 +08:00
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ChangeLog.d/issue4128.txt Normal file
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API changes
* The option `MBEDTLS_ECP_FIXED_POINT_OPTIM` use pre-computed comb tables
instead of computing tables in runtime. Thus, this option now use more
ROM, and it does not increase RAM usage in runtime anymore.

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docs/3.0-migration-guide.d/modify_MBEDTLS_ECP_FIXED_POINT_OPTIM_behaviour.md Normal file
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Change MBEDTLS_ECP_FIXED_POINT_OPTIM behaviour
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The option MBEDTLS_ECP_FIXED_POINT_OPTIM now use more ROM and does not increase
peak RAM usage anymore.
If you are limited by ROM space, you can define MBEDTLS_ECP_FIXED_POINT_OPTIM
to `0` in your config file. This will save about 50 KiB ROM space.