/* * Memory Setup stuff - taken from ??? * * See file CREDITS for list of people who contributed to this * 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; 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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * 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., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #include <config.h> #include <version.h> /* some parameters for the board */ SYSCON2: .long 0x80001100 MEMCFG1: .long 0x80000180 MEMCFG2: .long 0x800001C0 DRFPR: .long 0x80000200 syscon2_mask: .long 0x00000004 memcfg1_val: .long 0x160c1414 memcfg2_mask: .long 0x0000ffff @ only set lower 16 bits memcfg2_val: .long 0x00000000 @ upper 16 bits are reserved for CS7 + CS6 drfpr_val: .long 0x00000081 /* setting up the memory */ .globl lowlevel_init lowlevel_init: /* * DRFPR * 64kHz DRAM refresh */ ldr r0, DRFPR ldr r1, drfpr_val str r1, [r0] /* * SYSCON2: clear bit 2, DRAM is 32 bits wide */ ldr r0, SYSCON2 ldr r2, [r0] ldr r1, syscon2_mask bic r2, r2, r1 str r2, [r0] /* * MEMCFG1 * Setting up Keyboard at CS3, 8 Bit, 3 Waitstates * Setting up CS8900 (Ethernet) at CS2, 32 Bit, 5 Waitstates * Setting up flash at CS0 and CS1, 32 Bit, 3 Waitstates */ ldr r0, MEMCFG1 ldr r1, memcfg1_val str r1, [r0] /* * MEMCFG2 * Setting up ? with 0 * */ ldr r0, MEMCFG2 ldr r2, [r0] ldr r1, memcfg2_mask bic r2, r2, r1 ldr r1, memcfg2_val orr r2, r2, r1 str r2, [r0] /* everything is fine now */ mov pc, lr