From e258b9a2d52bb31d99405cad4b44047022dc4007 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ky=C3=B6sti=20M=C3=A4lkki?= Date: Fri, 18 Nov 2016 19:59:23 +0200 Subject: intel sandy/ivy: Improve DIMM replacement detection MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When MRC cache is available, first read only the SPD unique identifier bytes required to detect possible DIMM replacement. As this is 11 vs 256 bytes with slow SMBus operations, we save about 70ms for every installed DIMM on normal boot path. In the DIMM replacement case this adds some 10ms per installed DIMM as some SPD gets read twice, but we are on slow RAM training boot path anyways. Change-Id: I294a56e7b7562c3dea322c644b21a15abb033870 Signed-off-by: Kyösti Mälkki Reviewed-on: https://review.coreboot.org/17491 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel Reviewed-by: Aaron Durbin Reviewed-by: Patrick Rudolph --- src/mainboard/gigabyte/ga-b75m-d3h/romstage.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'src/mainboard/gigabyte/ga-b75m-d3h') diff --git a/src/mainboard/gigabyte/ga-b75m-d3h/romstage.c b/src/mainboard/gigabyte/ga-b75m-d3h/romstage.c index 06fee7ed88..0cac5098c4 100644 --- a/src/mainboard/gigabyte/ga-b75m-d3h/romstage.c +++ b/src/mainboard/gigabyte/ga-b75m-d3h/romstage.c @@ -177,11 +177,11 @@ const struct southbridge_usb_port mainboard_usb_ports[] = { { 1, 5, 6 }, }; -void mainboard_get_spd(spd_raw_data *spd) { - read_spd (&spd[0], 0x50); - read_spd (&spd[1], 0x51); - read_spd (&spd[2], 0x52); - read_spd (&spd[3], 0x53); +void mainboard_get_spd(spd_raw_data *spd, bool id_only) { + read_spd (&spd[0], 0x50, id_only); + read_spd (&spd[1], 0x51, id_only); + read_spd (&spd[2], 0x52, id_only); + read_spd (&spd[3], 0x53, id_only); } #if 0 -- cgit v1.2.3