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Documentation: Add deprecation notice for SAR support in VPD 

This change updates the release notes for coreboot-4.14 to add
deprecation notice for SAR support in VPD for Chrome OS platforms.

BUG=b:173465272

Change-Id: If6d511a22a3a2a31671dac91e57e801134d4ecf8
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51486
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Furquan Shaikh 2021-03-14 12:52:49 -07:00 committed by Patrick Georgi
parent 7fe5d3d382
commit 82dcd5b9ba
1 changed files with 24 additions and 0 deletions
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Documentation/releases/coreboot-4.14-relnotes.md
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@ -10,6 +10,30 @@ Update this document with changes that should be in the release notes.
* The chip and board additions and removals will be updated right
before the release, so those do not need to be added.
Deprecations
------------
### SAR support in VPD for Chrome OS
SAR support in VPD has been deprecated for Chrome OS platforms for > 1
year now. All new Chrome OS platforms have switched to using SAR
tables from CBFS. For the next release, coreboot is updated to align
with the Chrome OS factory changes and hence SAR support in VPD is
deprecated in [CB:51483](https://review.coreboot.org/51483). Starting
with this release, anyone building coreboot for an already released
Chrome OS platform with SAR table in VPD will have to extract the
"wifi_sar" key from VPD and add it as a file to CBFS using following
steps:
* On DUT, read SAR value using `vpd -i RO_VPD -g wifi_sar`
* In coreboot repo, generate CBFS SAR file using:
`echo ${SAR_STRING} > site-local/${BOARD}-sar.hex`
* Add to site-local/Kconfig:
```
config WIFI_SAR_CBFS_FILEPATH
string
default "site-local/${BOARD}-sar.hex"
```
Significant changes
-------------------