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* This file is part of the coreboot project.
* Copyright (C) 2006 Uwe Hermann <>
* 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; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
* Datasheet:
* - Name: Intel 440BX AGPset: 82443BX Host Bridge/Controller
* - URL:
* - PDF:
* - Order Number: 290633-001
* Host-to-PCI Bridge Registers.
* The values in parenthesis are the default values as per datasheet.
* Any addresses between 0x00 and 0xff not listed below are either
* Reserved or Intel Reserved and should not be touched.
#define NBXCFG 0x50 /* 440BX Configuration (0x0000:00S0_0000_000S_0S00b). */
#define DRAMC 0x57 /* DRAM Control (00S0_0000b). */
#define DRAMT 0x58 /* DRAM Timing (0x03). */
#define PAM 0x59 /* Programmable Attribute Map, 7 registers (0x00). */
#define PAM0 0x59
#define PAM1 0x5a
#define PAM2 0x5b
#define PAM3 0x5c
#define PAM4 0x5d
#define PAM5 0x5e
#define PAM6 0x5f
#define DRB 0x60 /* DRAM Row Boundary, 8 registers (0x01). */
#define DRB0 0x60
#define DRB1 0x61
#define DRB2 0x62
#define DRB3 0x63
#define DRB4 0x64
#define DRB5 0x65
#define DRB6 0x66
#define DRB7 0x67
#define FDHC 0x68 /* Fixed SDRAM Hole Control (0x00). */
#define MBSC 0x69 /* Memory Buffer Strength Control (0x0000-0000-0000). */
#define SMRAM 0x72 /* System Management RAM Control (0x02). */
#define ESMRAMC 0x73 /* Extended System Management RAM Control (0x38). */
#define RPS 0x74 /* SDRAM Row Page Size (0x0000). */
#define SDRAMC 0x76 /* SDRAM Control Register (0x0000). */
#define PGPOL 0x78 /* Paging Policy Register (0x00). */
#define PMCR 0x7a /* Power Management Control Register (0000_S0S0b). */
#define SCRR 0x7b /* Suspend CBR Refresh Rate Register (0x0038). */
#define EAP 0x80 /* Error Address Pointer Register (0x00000000). */
#define ERRCMD 0x90 /* Error Command Register (0x80). */
#define ERRSTS 0x91 /* Error Status (0x0000). */
// TODO: AGP stuff.
#define ACAPID 0xa0 /* AGP Capability Identifier (0x00100002 or 0x00000000) */
#define AGPSTAT 0xa4 /* AGP Status Register (0x1f000203, read only) */
#define AGPCMD 0xa8 /* AGP Command Register (0x00000000) */
#define AGPCTRL 0xb0 /* AGP Control Register (0x00000000) */
#define APSIZE 0xb4 /* Aperture Size Control Register (0x00) */
#define ATTBASE 0xb8 /* Aperture Translation Table (0x00000000) */
#define MBFS 0xca /* Memory Buffer Frequency Select (0x000000). */
#define BSPAD 0xd0 /* BIOS Scratch Pad (0x000..000). */
#define BSPAD0 0xd0 /* These are free for our use. */
#define BSPAD1 0xd1
#define BSPAD2 0xd2
#define BSPAD3 0xd3
#define BSPAD4 0xd4
#define BSPAD5 0xd5
#define BSPAD6 0xd6
#define BSPAD7 0xd7
#define DWTC 0xe0 /* DRAM Write Thermal Throttling Control (0x000..000). */
#define DRTC 0xe8 /* DRAM Read Thermal Throttling Control (0x000..000). */
#define BUFFC 0xf0 /* Buffer Control Register (0x0000). */