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spd_tools: bring README up to date 

bug=b:260128250
TEST=none

Change-Id: I412044a13f636e87db1d2266b33c9134e746e1a2
Signed-off-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76543
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Nick Vaccaro 2023-07-17 10:34:40 -07:00 committed by Felix Held
parent c39eb20027
commit ea025af4dc
1 changed files with 27 additions and 19 deletions
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46
util/spd_tools/README.md
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@ -32,10 +32,15 @@ IDs (configure DRAM hardware straps) for any memory part used by a board.
This program takes the following inputs:
* A JSON file containing a global list of memory parts with their attributes
as per the datasheet. This is the list of all known memory parts for the
given memory technology.
* The memory technology for which to generate the SPDs, e.g. "lp4x".
* Path to a JSON file containing a global list of memory parts with their
attributes as per the datasheet. This is the list of all known memory parts
for the given memory technology.
* The memory technology for which to generate the SPDs,
One of:
ddr4,
lp4x,
lp5
The input JSON file requires the following two fields for every memory part:
@ -456,20 +461,21 @@ The files generated are:
## Tool 2 - `part_id_gen`
This program takes the following inputs:
This program takes the following 4 inputs:
* The SoC platform which the board is based on, e.g. ADL.
* 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 or exclusive ID for each part and an optional SPD override file.
* 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. When using an SPD override file, the file will be searched
* for in the directory where mem_parts_used is located, if it is not found there then it
* will be searched for in the appropriate default spd directory.
* NOTE: Only assign a fixed/exclusive ID if required for legacy reasons.
* 1) The SoC platform which the board is based on, e.g. ADL.
* 2) The memory technology used by the board, One of ddr4, lp4x, or lp5.
* 3) The path to the directory where the generated Makefile.inc should be placed.
* 4) A CSV file containing a list of the memory parts used by the board, with an
optional fixed or exclusive ID for each part and an optional SPD override file.
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. When using an SPD override file, the file will be searched
for in the directory where mem_parts_used is located, if it is not found there then it
will be searched for in the appropriate default spd directory.
NOTE: Only assign a fixed/exclusive ID if required for legacy reasons.
Example of a CSV file using fixed and exclusive IDs, and SPD file overrides:
@ -560,10 +566,12 @@ Usage:
util/spd_tools/bin/spd_gen <mem_parts_list_json> <mem_technology>
```
Example:
Usage Examples:
```
util/spd_tools/bin/spd_gen spd/ddr4/memory_parts.json ddr4
util/spd_tools/bin/spd_gen spd/lp4x/memory_parts.json lp4x
util/spd_tools/bin/spd_gen spd/lp5/memory_parts.json lp5
```
### `part_id_gen`
@ -574,7 +582,7 @@ Usage:
util/spd_tools/bin/part_id_gen <platform> <mem_technology> <makefile_dir> <mem_parts_used_file>
```
Example:
Usage Example:
```
util/spd_tools/bin/part_id_gen \