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util/spd_tools: Add support for exclusive IDs

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Currently memory parts that use the same SPD are assigned the same ID by
spd_tools. This commit adds support for exclusive IDs. When given an
exclusive ID a memory part will not share its ID with other parts unless
they also have the same exclusive ID.

BUG=b:225161910
TEST=Ran part_id_gen and checked that exclusive IDs work correctly and
that the current behavior still works in their abscence.

Signed-off-by: Robert Zieba <robertzieba@google.com>
Change-Id: Ife5afe32337f69bc06451ce16238c7a83bc983c8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62905
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
This commit is contained in:
Robert Zieba
2022-03-17 13:14:12 -06:00
committed by Karthik Ramasubramanian
parent 5d3b1bbce4
commit a6425f170c
2 changed files with 62 additions and 17 deletions
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20
util/spd_tools/README.md
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@@ -459,10 +459,14 @@ This program takes the following inputs:
* The memory technology used by the board, e.g. lp4x.
* The path to the directory where the generated Makefile.inc should be placed.
* A CSV file containing a list of the memory parts used by the board, with an
optional fixed ID for each part. NOTE: Only assign a fixed ID if required
for legacy reasons.
* optional fixed or exclusive ID for each part. A fixed ID is simply an integer
* and it ensure that part (and any that share the same SPD) will be assigned
* that ID. An exclusive ID is prefixed with `*` and ensures that only parts with
* the same exclusive ID will be assigned that ID, even if they would otherwise
* share the same ID.
* NOTE: Only assign a fixed/exclusive ID if required for legacy reasons.
Example of a CSV file using fixed IDs:
Example of a CSV file using fixed and exclusive IDs:
```
K4AAG165WA-BCWE,1
@@ -470,13 +474,15 @@ MT40A512M16TB-062E:J
MT40A1G16KD-062E:E
K4A8G165WC-BCWE
H5AN8G6NDJR-XNC,8
H5ANAG6NCMR-XNC
H5ANAG6NCMR-XNC,*9
```
Explanation: This will ensure that the SPDs for K4AAG165WA-BCWE and
H5AN8G6NDJR-XNC are assigned to IDs 1 and 8 respectively. The SPDs for all other
memory parts will be assigned to the first compatible ID. Assigning fixed IDs
may result in duplicate SPD entries or gaps in the ID mapping.
H5AN8G6NDJR-XNC are assigned to IDs 1 and 8 respectively. H5ANAG6NCMR-XNC
will be assigned ID 9 and no other part will be assigned ID 9 even if it
shares the same SPD. The SPDs for all other memory parts will be assigned to
the first compatible ID. Assigning fixed/exclusive IDs may result in duplicate
SPD entries or gaps in the ID mapping.
### Output