microcode RAM capacity (before I-cache)

By: hobold (hobold.delete@this.vectorizer.org), February 23, 2020 3:33 am
Room: Moderated Discussions
anonymou5 (no.delete@this.spam.com) on February 22, 2020 2:49 pm wrote:
[...]
> also, with all the recent security fixes, I wonder how much on-die patch space they have left

Older processor models, with a longer history of accumulated fixes, probably don't have any space left. Remember how Intel initially promised Meltdown and Spectre microcode updates all the way back for very old product generations? Then they backpedaled and patched up only two or three older generations.

My guess is that at some point somebody looked back at the remaining microcode storage space, and forward at the as-of-yet undisclosed pipeline of future vulnerability disclosures. That person might have realized that the old product generations were already beyond hope of ever being fully patched.

So it wasn't just an unwanted expense. It was impossible, and therefore the attempt was pointless.
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      before I-cacheMark Roulo2020/02/21 05:03 PM
        before I-cacherwessel2020/02/22 01:13 PM
          before I-cacheanonymou52020/02/22 03:49 PM
            microcode RAM capacity (before I-cache)hobold2020/02/23 03:33 AM
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  Has there ever been a CPU with ...gallier22020/02/24 01:28 AM
  Has there ever been a CPU with ...Etienne2020/02/24 06:25 AM
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