diff options
| author | Timothy Pearson <tpearson@raptorengineering.com> | 2016-08-23 15:41:05 -0500 |
|---|---|---|
| committer | Timothy Pearson <tpearson@raptorengineering.com> | 2016-08-26 18:22:33 +0200 |
| commit | 6e5421d2a887737fc7c8a916d54151f9b1706f6d (patch) | |
| tree | 9cb049060ca5393f5ef8adea1ff0cb010cc78c61 /src/southbridge/amd/sb700/Kconfig | |
| parent | 3b0e761dd5008b9b87d207f9c7d7571fc880a523 (diff) | |
sb/amd/sb700: Add option to increase SPI speed to 33MHz
Some SB700-based systems and ROMs support high speed (33MHz) SPI
access instead of the power-on default 16.5MHz. Add an option
to enable high speed SPI access in the bootblock, and set the
default value to Disabled. This greatly decreases boot time on
SB700-based systems, especiall when a large payload is in use.
On a KGPE-D16 with a Petitboot (Linux + initramfs) payload, the
command prompt was accessible within 20 seconds of power on, which
incidentally is faster than the proprietary BIOS on the same machine
could even reach the GRUB bootloader.
Change-Id: Iadbd9bb611754262ef75a5e5a6ee4390a46e45cf
Signed-off-by: Timothy Pearson <tpearson@raptorengineering.com>
Test: Booted KGPE-D16 with Linux payload
Reviewed-on: https://review.coreboot.org/16306
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'src/southbridge/amd/sb700/Kconfig')
| -rw-r--r-- | src/southbridge/amd/sb700/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/southbridge/amd/sb700/Kconfig b/src/southbridge/amd/sb700/Kconfig index 9a988a90f8..353c2a46c7 100644 --- a/src/southbridge/amd/sb700/Kconfig +++ b/src/southbridge/amd/sb700/Kconfig @@ -25,6 +25,16 @@ config SOUTHBRIDGE_SPECIFIC_OPTIONS # dummy select HAVE_HARD_RESET select SMBUS_HAS_AUX_CHANNELS +config SOUTHBRIDGE_AMD_SB700_33MHZ_SPI + bool "Enable high speed SPI clock" + default n + help + When set, the SPI clock will run at 33MHz instead + of the compatibility mode 16.5MHz. Note that not + all ROMs are capable of 33MHz operation, so you + will need to verify this option is appropriate for + the ROM you are using. + # Set for southbridge SP5100 which also uses SB700 driver config SOUTHBRIDGE_AMD_SUBTYPE_SP5100 bool |