From d84276c49154537f7249628b945453538e6cf330 Mon Sep 17 00:00:00 2001 From: Jeff Andersen Date: Tue, 6 Aug 2024 14:04:54 -0700 Subject: [PATCH] Change field entropy size from 384 bits to 256 bits As per https://chipsalliance.github.io/caliptra-rtl/main/external-regs/?p=caliptra_top_reg.generic_and_fuse_reg.fuse_field_entropy%5B0%5D this is 32 bytes. --- rom/dev/README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/rom/dev/README.md b/rom/dev/README.md index be0a63aab0..f35bb9a3bd 100644 --- a/rom/dev/README.md +++ b/rom/dev/README.md @@ -48,7 +48,7 @@ Following are the main FUSE & Architectural Registers used by the Caliptra ROM f | :------------------------------ | :------------| :----------------------------------------------------- | | CPTRA_SECURITY_STATE | 32 | Security State of the device. Contains two fields:
**LIFECYCLE_STATE**: Unprovisioned, Manufacturing or Production
**DEBUG_ENABLED**: Boolean indicating if debug is enabled or not | | FUSE_UDS_SEED | 384 | Obfuscated UDS | -| FUSE_FIELD_ENTROPY | 384 | Obfuscated Field Entropy | +| FUSE_FIELD_ENTROPY | 256 | Obfuscated Field Entropy | | FUSE_KEY_MANIFEST_PK_HASH | 384 | Hash of the four ECC and thirty-two LMS Manufacturer Public Keys | | FUSE_KEY_MANIFEST_PK_HASH_MASK | 32 | Manufacturer ECC Public Key Revocation Mask | | FUSE_LMS_REVOCATION | 32 | Manufacturer LMS Public Key Revocation Mask |