mb/google/rex/var/rex0: Reduce camera NVM size to 8KB
The actual NVM size of camera module is 64KB; however, only 8KB is in
use to store data. This reduces the size of both NVM0 and NVM1 to 8KB
to minimize the time taken to read NVM and launch Camera preview.
BUG=NONE
TEST=Launch Chrome camera application and check the time taken to
read eeprom from camera service log and show camera preview. It takes
2 to 3 seconds to show camera preview while it takes 4 to 5 seconds
without the changes.
Before the changes:
06:21:04.204944Z OpenDevice(): camera_id = 1
06:21:07.297584Z Read camera eeprom from eeprom
06:21:08.763491Z Read camera eeprom from nvmem
After the changes:
21:37:23.923676Z OpenDevice(): camera_id = 1
21:37:24.386020Z Read camera eeprom from eeprom
21:37:24.574515Z Read camera eeprom from nvmem
Change-Id: I0e2272b3307fea60ea7406fc6899ae2cb0134fa3
Signed-off-by: Jamie Ryu <jamie.m.ryu@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76189
Reviewed-by: Kiran2 Kumar <kiran2.kumar@intel.corp-partner.google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
diff --git a/src/mainboard/google/rex/variants/rex0/overridetree.cb b/src/mainboard/google/rex/variants/rex0/overridetree.cb
index 4f74ea4..793a46d 100644
--- a/src/mainboard/google/rex/variants/rex0/overridetree.cb
+++ b/src/mainboard/google/rex/variants/rex0/overridetree.cb
@@ -535,10 +535,10 @@
register "nvm_compat" = ""atmel,24c64""
- register "nvm_size" = "0x10000"
+ register "nvm_size" = "0x2000"
register "nvm_pagesize" = "0x01"
register "nvm_readonly" = "0x01"
- register "nvm_width" = "0x0E"
+ register "nvm_width" = "0x10"
register "max_dstate_for_probe" = "ACPI_DEVICE_SLEEP_D0"
@@ -656,7 +656,7 @@
register "chip_name" = ""ST M24C64X""
register "device_type" = "INTEL_ACPI_CAMERA_NVM"
- register "nvm_size" = "0x10000"
+ register "nvm_size" = "0x2000"
register "nvm_pagesize" = "1"
register "nvm_readonly" = "1"
register "nvm_width" = "0x10"