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https://github.com/AsahiLinux/u-boot
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7a837b7310
This patch adds support for the MX31ADS evaluation board from Freescale, initialization code is copied from RedBoot sources, also provided by Freescale. Signed-off-by: Guennadi Liakhovetski <lg@denx.de>
94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/*
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* Copyright (C) 2008, Guennadi Liakhovetski <lg@denx.de>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/mx31.h>
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#include <asm/arch/mx31-regs.h>
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DECLARE_GLOBAL_DATA_PTR;
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int dram_init(void)
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{
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gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
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gd->bd->bi_dram[0].size = PHYS_SDRAM_1_SIZE;
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return 0;
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}
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int board_init(void)
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{
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int i;
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#if 0
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/* CS0: Nor Flash */
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/*
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* These are values from the RedBoot sources by Freescale. However,
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* under U-Boot with this configuration 32-bit accesses don't work,
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* lower 16 bits of data are read twice for each 32-bit read.
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*/
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__REG(CSCR_U(0)) = 0x23524E80;
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__REG(CSCR_L(0)) = 0x10000D03; /* WRAP bit (1) is suspicious here, but
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* disabling it doesn't help either */
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__REG(CSCR_A(0)) = 0x00720900;
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#endif
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/* setup pins for UART1 */
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mx31_gpio_mux(MUX_RXD1__UART1_RXD_MUX);
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mx31_gpio_mux(MUX_TXD1__UART1_TXD_MUX);
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mx31_gpio_mux(MUX_RTS1__UART1_RTS_B);
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mx31_gpio_mux(MUX_RTS1__UART1_CTS_B);
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/* PBC setup */
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/* Enable UART transceivers also reset the Ethernet/external UART */
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readw(CS4_BASE + 4);
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writew(0x8023, CS4_BASE + 4);
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/* RedBoot also has an empty loop with 100000 iterations here -
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* clock doesn't run yet */
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for (i = 0; i < 100000; i++)
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;
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/* Clear the reset, toggle the LEDs */
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writew(0xDF, CS4_BASE + 6);
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/* clock still doesn't run */
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for (i = 0; i < 100000; i++)
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;
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/* See 1.5.4 in IMX31ADSE_PERI_BUS_CNTRL_CPLD_RM.pdf */
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readb(CS4_BASE + 8);
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readb(CS4_BASE + 7);
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readb(CS4_BASE + 8);
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readb(CS4_BASE + 7);
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gd->bd->bi_arch_number = 447; /* board id for linux */
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gd->bd->bi_boot_params = 0x80000100; /* adress of boot parameters */
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return 0;
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}
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int checkboard(void)
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{
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printf("Board: MX31ADS\n");
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return 0;
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}
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