On 10/17/10 6:49 PM, Scott Duplichan wrote: > This patch enables SB700 option PrefetchEnSPIFromHost in early setup. > It affects only systems booting from SPI flash, not those booting from > LPC flash. By default, the SB700 reads dwords from the SPI flash chip. > Setting PrefetchEnSPIFromHost causes the SB700 to read entire cache > lines from the flash chip. > > Thanks, > Scott > > Signed-off-by: Scott Duplichan <[email protected]>
Acked-by: Stefan Reinauer <[email protected]> > Index: src/southbridge/amd/sb700/sb700_early_setup.c > =================================================================== > --- src/southbridge/amd/sb700/sb700_early_setup.c (revision 5964) > +++ src/southbridge/amd/sb700/sb700_early_setup.c (working copy) > @@ -129,6 +129,11 @@ > reg8 |= (1 << 5) | (1 << 6); > pci_write_config8(dev, 0x47, reg8); > > + /* Enable PrefetchEnSPIFromHost to speed up SPI flash read (does not > affect LPC) */ > + reg8 = pci_read_config8(dev, 0xbb); > + reg8 |= 1 << 0; > + pci_write_config8(dev, 0xbb, reg8); > + > /* SuperIO, LPC ROM */ > reg8 = pci_read_config8(dev, 0x48); > /* Decode ports 0x2e-0x2f, 0x4e-0x4f (SuperI/O configuration) */ > > > -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
