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According to ArmARM: SHA2, bits [15:12] 0b0000 No SHA2 instructions implemented. FEAT_SHA256 implements the functionality identified by the value 0b0001. If the value of ID_AA64ISAR0_EL1.SHA1 is 0b0000, this field must have the value 0b0000. SHA1, bits [11:8] 0b0000 No SHA1 instructions implemented. FEAT_SHA1 implements the functionality identified by the value 0b0001. If the value of ID_AA64ISAR0_EL1.SHA2 is 0b0000, this field must have the value 0b0000. To my understanding this means you can't have one without the other.
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