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/*
* This file is part of the coreboot project.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/bootblock.h>
#include <device/pci_ops.h>
#include "i945.h"
void bootblock_early_northbridge_init(void)
{
uint32_t reg;
/*
* The "io" variant of the config access is explicitly used to
* setup the PCIEXBAR because CONFIG_MMCONF_SUPPORT is set to true.
* That way all subsequent non-explicit config accesses use
* MCFG. This code also assumes that bootblock_northbridge_init() is
* the first thing called in the non-asm boot block code. The final
* assumption is that no assembly code is using the
* CONFIG_MMCONF_SUPPORT option to do PCI config accesses.
*
* The PCIEXBAR is assumed to live in the memory mapped IO space under
* 4GiB.
*/
reg = CONFIG_MMCONF_BASE_ADDRESS | 4 | 1; /* 64MiB - 0-63 buses. */
pci_io_write_config32(PCI_DEV(0, 0, 0), PCIEXBAR, reg);
}
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