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README.md: Update Configuration section

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Signed-off-by: Ronald Cron <ronald.cron@arm.com>
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Ronald Cron
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configs/README.txt
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This directory contains example configuration files.
The examples are generally focused on a particular usage case (eg, support for
a restricted number of ciphersuites) and aim at minimizing resource usage for
this target. They can be used as a basis for custom configurations.
The examples are generally focused on a particular use case (eg, support for
a restricted set of ciphersuites) and aim to minimize resource usage for
the target. They can be used as a basis for custom configurations.
These files are complete replacements for the default mbedtls_config.h. To use one of
them, you can pick one of the following methods:
These files come in pairs and are complete replacements for the default
mbedtls_config.h and crypto_config.h. The two files of a pair share the same or
very similar name, with the crypto file prefixed by "crypto-". Note
that some of the cryptography configuration files may be located in
tf-psa-crypto/configs.
1. Replace the default file include/mbedtls/mbedtls_config.h with the chosen one.
To use one of these pairs, you can pick one of the following methods:
2. Define MBEDTLS_CONFIG_FILE and adjust the include path accordingly.
For example, using make:
1. Replace the default files include/mbedtls/mbedtls_config.h and
tf-psa-crypto/include/psa/crypto_config.h with the chosen ones.
CFLAGS="-I$PWD/configs -DMBEDTLS_CONFIG_FILE='<foo.h>'" make
2. Use the MBEDTLS_CONFIG_FILE and TF_PSA_CRYPTO_CONFIG_FILE options of the
CMake build system:
Or, using cmake:
cmake -DMBEDTLS_CONFIG_FILE="path-to-your-mbedtls-config-file" \
-DTF_PSA_CRYPTO_CONFIG_FILE="path-to-your-tf-psa-crypto-config-file" .
make
find . -iname '*cmake*' -not -name CMakeLists.txt -exec rm -rf {} +
CFLAGS="-I$PWD/configs -DMBEDTLS_CONFIG_FILE='<foo.h>'" cmake .
make
Note that the second method also works if you want to keep your custom
configuration file outside the Mbed TLS tree.
The second method also works if you want to keep your custom configuration
files outside the Mbed TLS tree.