mrc_cache: Remove unnecessary data checksum calculation
When MRC_SAVE_HASH_IN_TPM is selected, we can just use the TPM hash to verify the MRC_CACHE data. Thus, we don't need to calculate the checksum anymore in this case. BUG=b:150502246 BRANCH=None TEST=make sure memory training still works on nami Change-Id: I1db4469da49755805b541f50c7ef2f9cdb749425 Signed-off-by: Shelley Chen <shchen@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/46515 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Furquan Shaikh <furquan@google.com>
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@ -193,18 +193,19 @@ static int mrc_data_valid(int type, const struct mrc_metadata *md,
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if (md->data_size != data_size)
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return -1;
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checksum = compute_ip_checksum(data, data_size);
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if (md->data_checksum != checksum) {
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printk(BIOS_ERR, "MRC: data checksum mismatch: %x vs %x\n",
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md->data_checksum, checksum);
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return -1;
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}
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hash_idx = cr->tpm_hash_index;
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if (hash_idx && CONFIG(MRC_SAVE_HASH_IN_TPM) &&
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!mrc_cache_verify_hash(hash_idx, data, data_size))
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return -1;
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if (hash_idx && CONFIG(MRC_SAVE_HASH_IN_TPM)) {
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if (!mrc_cache_verify_hash(hash_idx, data, data_size))
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return -1;
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} else {
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checksum = compute_ip_checksum(data, data_size);
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if (md->data_checksum != checksum) {
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printk(BIOS_ERR, "MRC: data checksum mismatch: %x vs %x\n",
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md->data_checksum, checksum);
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return -1;
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}
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}
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return 0;
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}
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