[coreboot] [commit] r6582 - trunk/src/mainboard/amd/persimmon
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Sun May 15 23:48:24 CEST 2011
Author: mjones
Date: Sun May 15 23:48:22 2011
New Revision: 6582
URL: https://tracker.coreboot.org/trac/coreboot/changeset/6582
Log:
Enable 33 MHz fast mode SPI read early to reduce boot time.
Signed-off-by: Scott Duplichan <scott at notabs.org>
Acked-by: Marc Jones <marcj303 at gmail.com>
Modified:
trunk/src/mainboard/amd/persimmon/romstage.c
Modified: trunk/src/mainboard/amd/persimmon/romstage.c
==============================================================================
--- trunk/src/mainboard/amd/persimmon/romstage.c Sun May 15 23:45:46 2011 (r6581)
+++ trunk/src/mainboard/amd/persimmon/romstage.c Sun May 15 23:48:22 2011 (r6582)
@@ -47,6 +47,19 @@
u32 val;
u8 reg8;
+ // early enable of SPI 33 MHz fast mode read
+ if (boot_cpu())
+ {
+ volatile u32 *spiBase = (void *) 0xa0000000;
+ u32 save;
+ __outdword (0xcf8, 0x8000a3a0);
+ save = __indword (0xcfc);
+ __outdword (0xcfc, (u32) spiBase | 2); // set temp MMIO base
+ spiBase [3] = (spiBase [3] & ~(3 << 14)) | (1 << 14);
+ spiBase [0] |= 1 << 18; // fast read enable
+ __outdword (0xcfc, save); // clear temp base
+ }
+
if (!cpu_init_detectedx && boot_cpu()) {
post_code(0x30);
sb_poweron_init();
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