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开发环境：win7 64位 + VMware12 + Ubuntu14.04 64位
工具链：linaro提供的gcc-linaro-6.1.1-2016.08-x86_64_arm-linux-gnueabi
要移植的u-boot版本：u-boot-2016-11
Tiny4412开发板硬件版本为：
底板： Tiny4412/Super4412SDK 1506
核心板：Tiny4412 - 1412
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
在上一节中我们把tiny4412开发板上的COM0串口用起来，可以通过COM0串口输出一些调试信息。接下来要做的是初始化tiny4412开发板上的DDR3内存。
1、Tiny4412开发板上的DDR3内存
原理图：Tiny4412-1412-Schematic.pdf
从原理图上可以看出，使用2片K4B4G1646B-HCK内存芯片并联组成了数据位为32bit 1G大小的内存。内存芯片接在exynos4412芯片的DMC0上，使用了一个chip(chip0)，内存地址空间为0x40000000-0x80000000。
2、Exynos4412芯片DMC初始化步骤
具体信息在 《Exynos 4412 SCP_Users Manual_Ver.0.10.00_Preliminary.pdf》第18章Dynamic Memory Controller
3、Tiny4412 DDR3初始化代码
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diff --git a/arch/arm/mach-exynos/dmc_init_exynos4412.c b/arch/arm/mach-exynos/dmc_init_exynos4412.c new file mode 100644 index 0000000..27f72cd --- /dev/null +++ b/arch/arm/mach-exynos/dmc_init_exynos4412.c @@ -0,0 +1,254 @@ +/* + * Memory setup for board based on EXYNOS4412 + * + * 2016 + * Modified by AP0904225 <ap0904225@qq.com> + * + * Copyright (C) 2013 Samsung Electronics + * Rajeshwari Shinde <rajeshwari.s@samsung.com> + * + * 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 <asm/arch/dmc.h> +#include "common_setup.h" +#include "exynos4412_setup.h" + +#ifdef TINY4412 +struct mem_timings mem = { + .direct_cmd_msr = { + DIRECT_CMD1, DIRECT_CMD2, DIRECT_CMD3, DIRECT_CMD4 + }, + .timingref = 0x000000BB, + .timingrow = 0x6946654f, + .timingdata = 0x46460506, + .timingpower = 0x5200183c, + .zqcontrol = 0xE3854C03, + .control0 = 0x71101008, + .control1 = 0xe0000086, + .control2 = 0x00000000, + .concontrol = 0x0FFF301A, + .prechconfig = 0xff000000, + .memcontrol = 0x00302640, /* Tiny4412-1412 core board only use chip0 */ + .memconfig0 = 0x40C01333, /* ROW is 15bit */ + .memconfig1 = 0x80C01333, /* DMC0 address up to 0x7FFFFFFF */ + .dll_resync = FORCE_DLL_RESYNC, + .dll_on = DLL_CONTROL_ON, + +}; +#else +struct mem_timings mem = { + .direct_cmd_msr = { + DIRECT_CMD1, DIRECT_CMD2, DIRECT_CMD3, DIRECT_CMD4 + }, + .timingref = TIMINGREF_VAL, + .timingrow = TIMINGROW_VAL, + .timingdata = TIMINGDATA_VAL, + .timingpower = TIMINGPOWER_VAL, + .zqcontrol = ZQ_CONTROL_VAL, + .control0 = CONTROL0_VAL, + .control1 = CONTROL1_VAL, + .control2 = CONTROL2_VAL, + .concontrol = CONCONTROL_VAL, + .prechconfig = PRECHCONFIG, + .memcontrol = MEMCONTROL_VAL, + .memconfig0 = MEMCONFIG0_VAL, + .memconfig1 = MEMCONFIG1_VAL, + .dll_resync = FORCE_DLL_RESYNC, + .dll_on = DLL_CONTROL_ON, +}; +#endif + +static void phy_control_reset(int ctrl_no, struct exynos4_dmc *dmc) +{ + if (ctrl_no) { + writel((mem.control1 | (1 << mem.dll_resync)), + &dmc->phycontrol1); + writel((mem.control1 | (0 << mem.dll_resync)), + &dmc->phycontrol1); + } else { + writel((mem.control0 | (0 << mem.dll_on)), + &dmc->phycontrol0); + writel((mem.control0 | (1 << mem.dll_on)), + &dmc->phycontrol0); + } +} + +static void dmc_config_mrs(struct exynos4_dmc *dmc, int chip) +{ + int i; + unsigned long mask = 0; + + if (chip) + mask = DIRECT_CMD_CHIP1_SHIFT; + + for (i = 0; i < MEM_TIMINGS_MSR_COUNT; i++) { + writel(mem.direct_cmd_msr[i] | mask, + &dmc->directcmd); + } +} + +static void dmc_init(struct exynos4_dmc *dmc) +{ + /* + * DLL Parameter Setting: + * Termination: Enable R/W + * Phase Delay for DQS Cleaning: 180' Shift + */ + writel(mem.control1, &dmc->phycontrol1); + + /* + * ZQ Calibration + * Termination: Disable + * Auto Calibration Start: Enable + */ + writel(mem.zqcontrol, &dmc->phyzqcontrol); + sdelay(0x100000); + + /* + * Update DLL Information: + * Force DLL Resyncronization + */ + phy_control_reset(1, dmc); + phy_control_reset(0, dmc); + + /* Set DLL Parameters */ + writel(mem.control1, &dmc->phycontrol1); + + /* DLL Start */ + writel((mem.control0 | CTRL_START | CTRL_DLL_ON), &dmc->phycontrol0); + + writel(mem.control2, &dmc->phycontrol2); + + /* Set Clock Ratio of Bus clock to Memory Clock */ + writel(mem.concontrol, &dmc->concontrol); + + /* + * Memor Burst length: 8 + * Number of chips: 2 + * Memory Bus width: 32 bit + * Memory Type: DDR3 + * Additional Latancy for PLL: 1 Cycle + */ + writel(mem.memcontrol, &dmc->memcontrol); + + writel(mem.memconfig0, &dmc->memconfig0); + writel(mem.memconfig1, &dmc->memconfig1); + +#ifdef TINY4412 + writel(0x8000001F, &dmc->ivcontrol); +#endif + + /* Config Precharge Policy */ + writel(mem.prechconfig, &dmc->prechconfig); + /* + * TimingAref, TimingRow, TimingData, TimingPower Setting: + * Values as per Memory AC Parameters + */ + writel(mem.timingref, &dmc->timingref); + writel(mem.timingrow, &dmc->timingrow); + writel(mem.timingdata, &dmc->timingdata); + writel(mem.timingpower, &dmc->timingpower); + + /* Chip0: NOP Command: Assert and Hold CKE to high level */ + writel(DIRECT_CMD_NOP, &dmc->directcmd); + sdelay(0x100000); + + /* Chip0: EMRS2, EMRS3, EMRS, MRS Commands Using Direct Command */ + dmc_config_mrs(dmc, 0); + sdelay(0x100000); + + /* Chip0: ZQINIT */ + writel(DIRECT_CMD_ZQ, &dmc->directcmd); + sdelay(0x100000); + +#ifndef TINY4412 + /* Chip1: NOP Command: Assert and Hold CKE to high level */ + writel((DIRECT_CMD_NOP | DIRECT_CMD_CHIP1_SHIFT), &dmc->directcmd); + sdelay(0x100000); + + /* Chip1: EMRS2, EMRS3, EMRS, MRS Commands Using Direct Command */ + dmc_config_mrs(dmc, 1); + sdelay(0x100000); + + /* Chip1: ZQINIT */ + writel((DIRECT_CMD_ZQ | DIRECT_CMD_CHIP1_SHIFT), &dmc->directcmd); + sdelay(0x100000); +#endif + + phy_control_reset(1, dmc); + sdelay(0x100000); + + /* turn on DREX0, DREX1 */ + writel((mem.concontrol | AREF_EN), &dmc->concontrol); +} + +void mem_ctrl_init(int reset) +{ + struct exynos4_dmc *dmc; + + /* + * Async bridge configuration at CPU_core: + * 1: half_sync + * 0: full_sync + */ + writel(1, ASYNC_CONFIG); + +#ifndef TINY4412 +#ifdef CONFIG_ORIGE + /* Interleave: 2Bit, Interleave_bit1: 0x15, Interleave_bit0: 0x7 */ + writel(APB_SFR_INTERLEAVE_CONF_VAL, EXYNOS4_MIU_BASE + + APB_SFR_INTERLEAVE_CONF_OFFSET); + /* Update MIU Configuration */ + writel(APB_SFR_ARBRITATION_CONF_VAL, EXYNOS4_MIU_BASE + + APB_SFR_ARBRITATION_CONF_OFFSET); +#else + writel(APB_SFR_INTERLEAVE_CONF_VAL, EXYNOS4_MIU_BASE + + APB_SFR_INTERLEAVE_CONF_OFFSET); + writel(INTERLEAVE_ADDR_MAP_START_ADDR, EXYNOS4_MIU_BASE + + ABP_SFR_INTERLEAVE_ADDRMAP_START_OFFSET); + writel(INTERLEAVE_ADDR_MAP_END_ADDR, EXYNOS4_MIU_BASE + + ABP_SFR_INTERLEAVE_ADDRMAP_END_OFFSET); + writel(INTERLEAVE_ADDR_MAP_EN, EXYNOS4_MIU_BASE + + ABP_SFR_SLV_ADDRMAP_CONF_OFFSET); +#ifdef CONFIG_MIU_LINEAR + writel(SLAVE0_SINGLE_ADDR_MAP_START_ADDR, EXYNOS4_MIU_BASE + + ABP_SFR_SLV0_SINGLE_ADDRMAP_START_OFFSET); + writel(SLAVE0_SINGLE_ADDR_MAP_END_ADDR, EXYNOS4_MIU_BASE + + ABP_SFR_SLV0_SINGLE_ADDRMAP_END_OFFSET); + writel(SLAVE1_SINGLE_ADDR_MAP_START_ADDR, EXYNOS4_MIU_BASE + + ABP_SFR_SLV1_SINGLE_ADDRMAP_START_OFFSET); + writel(SLAVE1_SINGLE_ADDR_MAP_END_ADDR, EXYNOS4_MIU_BASE + + ABP_SFR_SLV1_SINGLE_ADDRMAP_END_OFFSET); + writel(APB_SFR_SLV_ADDR_MAP_CONF_VAL, EXYNOS4_MIU_BASE + + ABP_SFR_SLV_ADDRMAP_CONF_OFFSET); +#endif +#endif +#endif + + /* DREX0 */ + dmc = (struct exynos4_dmc *)samsung_get_base_dmc_ctrl(); + dmc_init(dmc); + + /* DREX1 */ + dmc = (struct exynos4_dmc *)(samsung_get_base_dmc_ctrl() + + DMC_OFFSET); + dmc_init(dmc); +} diff --git a/arch/arm/mach-exynos/exynos4412_setup.h b/arch/arm/mach-exynos/exynos4412_setup.h index a05301a..f0a032b 100644 --- a/arch/arm/mach-exynos/exynos4412_setup.h +++ b/arch/arm/mach-exynos/exynos4412_setup.h @@ -347,4 +347,199 @@ DIV_MMC4_PRE(DIV_STAT_CHANGING)) +/* Bus Configuration Register Address */ +#define ASYNC_CONFIG 0x10010350 + +/* DMC */ +#define DIRECT_CMD_NOP 0x07000000 +#define DIRECT_CMD_ZQ 0x0a000000 +#define DIRECT_CMD_CHIP1_SHIFT (1 << 20) +#define MEM_TIMINGS_MSR_COUNT 4 +#define CTRL_START (1 << 0) +#define CTRL_DLL_ON (1 << 1) +#define AREF_EN (1 << 5) +#define DRV_TYPE (1 << 6) + +struct mem_timings { + unsigned direct_cmd_msr[MEM_TIMINGS_MSR_COUNT]; + unsigned timingref; + unsigned timingrow; + unsigned timingdata; + unsigned timingpower; + unsigned zqcontrol; + unsigned control0; + unsigned control1; + unsigned control2; + unsigned concontrol; + unsigned prechconfig; + unsigned memcontrol; + unsigned memconfig0; + unsigned memconfig1; + unsigned dll_resync; + unsigned dll_on; +}; + +/* MIU */ +/* MIU Config Register Offsets*/ +#define APB_SFR_INTERLEAVE_CONF_OFFSET 0x400 +#define APB_SFR_ARBRITATION_CONF_OFFSET 0xC00 +#define ABP_SFR_SLV_ADDRMAP_CONF_OFFSET 0x800 +#define ABP_SFR_INTERLEAVE_ADDRMAP_START_OFFSET 0x808 +#define ABP_SFR_INTERLEAVE_ADDRMAP_END_OFFSET 0x810 +#define ABP_SFR_SLV0_SINGLE_ADDRMAP_START_OFFSET 0x818 +#define ABP_SFR_SLV0_SINGLE_ADDRMAP_END_OFFSET 0x820 +#define ABP_SFR_SLV1_SINGLE_ADDRMAP_START_OFFSET 0x828 +#define ABP_SFR_SLV1_SINGLE_ADDRMAP_END_OFFSET 0x830 + + +#ifdef TINY4412 +/* Interleave: 2Bit, Interleave_bit1: 0x15, Interleave_bit0: 0x7 */ +#define APB_SFR_INTERLEAVE_CONF_VAL 0x20001507 +#define APB_SFR_ARBRITATION_CONF_VAL 0x00000001 +#endif + +#define INTERLEAVE_ADDR_MAP_START_ADDR 0x40000000 +#define INTERLEAVE_ADDR_MAP_END_ADDR 0xbfffffff +#define INTERLEAVE_ADDR_MAP_EN 0x00000001 + +#ifdef CONFIG_MIU_1BIT_INTERLEAVED +/* Interleave_bit0: 0xC*/ +#define APB_SFR_INTERLEAVE_CONF_VAL 0x0000000c +#endif +#ifdef CONFIG_MIU_2BIT_INTERLEAVED +/* Interleave: 2Bit, Interleave_bit1: 0x15, Interleave_bit0: 0xc */ +#define APB_SFR_INTERLEAVE_CONF_VAL 0x2000150c +#endif +#define SLAVE0_SINGLE_ADDR_MAP_START_ADDR 0x40000000 +#define SLAVE0_SINGLE_ADDR_MAP_END_ADDR 0x7fffffff +#define SLAVE1_SINGLE_ADDR_MAP_START_ADDR 0x80000000 +#define SLAVE1_SINGLE_ADDR_MAP_END_ADDR 0xbfffffff +/* Enable SME0 and SME1*/ +#define APB_SFR_SLV_ADDR_MAP_CONF_VAL 0x00000006 + +#define FORCE_DLL_RESYNC 3 +#define DLL_CONTROL_ON 1 + +#define DIRECT_CMD1 0x00020000 +#define DIRECT_CMD2 0x00030000 +#define DIRECT_CMD3 0x00010002 +#define DIRECT_CMD4 0x00000328 + +#define CTRL_ZQ_MODE_NOTERM (0x1 << 0) +#define CTRL_ZQ_START (0x1 << 1) +#define CTRL_ZQ_DIV (0 << 4) +#define CTRL_ZQ_MODE_DDS (0x7 << 8) +#define CTRL_ZQ_MODE_TERM (0x2 << 11) +#define CTRL_ZQ_FORCE_IMPN (0x5 << 14) +#define CTRL_ZQ_FORCE_IMPP (0x6 << 17) +#define CTRL_DCC (0xE38 << 20) +#define ZQ_CONTROL_VAL (CTRL_ZQ_MODE_NOTERM | CTRL_ZQ_START\ + | CTRL_ZQ_DIV | CTRL_ZQ_MODE_DDS\ + | CTRL_ZQ_MODE_TERM | CTRL_ZQ_FORCE_IMPN\ + | CTRL_ZQ_FORCE_IMPP | CTRL_DCC) + +#define ASYNC (0 << 0) +#define CLK_RATIO (1 << 1) +#define DIV_PIPE (1 << 3) +#define AWR_ON (1 << 4) +#define AREF_DISABLE (0 << 5) +#define DRV_TYPE_DISABLE (0 << 6) +#define CHIP0_NOT_EMPTY (0 << 8) +#define CHIP1_NOT_EMPTY (0 << 9) +#define DQ_SWAP_DISABLE (0 << 10) +#define QOS_FAST_DISABLE (0 << 11) +#define RD_FETCH (0x3 << 12) +#define TIMEOUT_LEVEL0 (0xFFF << 16) +#define CONCONTROL_VAL (ASYNC | CLK_RATIO | DIV_PIPE | AWR_ON\ + | AREF_DISABLE | DRV_TYPE_DISABLE\ + | CHIP0_NOT_EMPTY | CHIP1_NOT_EMPTY\ + | DQ_SWAP_DISABLE | QOS_FAST_DISABLE\ + | RD_FETCH | TIMEOUT_LEVEL0) + +#define CLK_STOP_DISABLE (0 << 1) +#define DPWRDN_DISABLE (0 << 2) +#define DPWRDN_TYPE (0 << 3) +#define TP_DISABLE (0 << 4) +#define DSREF_DIABLE (0 << 5) +#define ADD_LAT_PALL (1 << 6) +#define MEM_TYPE_DDR3 (0x6 << 8) +#define MEM_WIDTH_32 (0x2 << 12) +#define NUM_CHIP_2 (1 << 16) +#define BL_8 (0x3 << 20) +#define MEMCONTROL_VAL (CLK_STOP_DISABLE | DPWRDN_DISABLE\ + | DPWRDN_TYPE | TP_DISABLE | DSREF_DIABLE\ + | ADD_LAT_PALL | MEM_TYPE_DDR3 | MEM_WIDTH_32\ + | NUM_CHIP_2 | BL_8) + + +#define CHIP_BANK_8 (0x3 << 0) +#define CHIP_ROW_14 (0x2 << 4) +#define CHIP_COL_10 (0x3 << 8) +#define CHIP_MAP_INTERLEAVED (1 << 12) +#define CHIP_MASK (0xe0 << 16) +#ifdef CONFIG_MIU_LINEAR +#define CHIP0_BASE (0x40 << 24) +#define CHIP1_BASE (0x60 << 24) +#else +#define CHIP0_BASE (0x20 << 24) +#define CHIP1_BASE (0x40 << 24) +#endif +#define MEMCONFIG0_VAL (CHIP_BANK_8 | CHIP_ROW_14 | CHIP_COL_10\ + | CHIP_MAP_INTERLEAVED | CHIP_MASK | CHIP0_BASE) +#define MEMCONFIG1_VAL (CHIP_BANK_8 | CHIP_ROW_14 | CHIP_COL_10\ + | CHIP_MAP_INTERLEAVED | CHIP_MASK | CHIP1_BASE) + +#define TP_CNT (0xff << 24) +#define PRECHCONFIG TP_CNT + +#define CTRL_OFF (0 << 0) +#define CTRL_DLL_OFF (0 << 1) +#define CTRL_HALF (0 << 2) +#define CTRL_DFDQS (1 << 3) +#define DQS_DELAY (0 << 4) +#define CTRL_START_POINT (0x10 << 8) +#define CTRL_INC (0x10 << 16) +#define CTRL_FORCE (0x71 << 24) +#define CONTROL0_VAL (CTRL_OFF | CTRL_DLL_OFF | CTRL_HALF\ + | CTRL_DFDQS | DQS_DELAY | CTRL_START_POINT\ + | CTRL_INC | CTRL_FORCE) + +#define CTRL_SHIFTC (0x6 << 0) +#define CTRL_REF (8 << 4) +#define CTRL_SHGATE (1 << 29) +#define TERM_READ_EN (1 << 30) +#define TERM_WRITE_EN (1 << 31) +#define CONTROL1_VAL (CTRL_SHIFTC | CTRL_REF | CTRL_SHGATE\ + | TERM_READ_EN | TERM_WRITE_EN) + +#define CONTROL2_VAL 0x00000000 + +#ifdef TINY4412 +#define TIMINGREF_VAL 0x000000BB +#define TIMINGROW_VAL 0x4046654f +#define TIMINGDATA_VAL 0x46400506 +#define TIMINGPOWER_VAL 0x52000A3C +#else +#define TIMINGREF_VAL 0x000000BC +#ifdef DRAM_CLK_330 +#define TIMINGROW_VAL 0x3545548d +#define TIMINGDATA_VAL 0x45430506 +#define TIMINGPOWER_VAL 0x4439033c +#endif +#ifdef DRAM_CLK_400 +#define TIMINGROW_VAL 0x45430506 +#define TIMINGDATA_VAL 0x56500506 +#define TIMINGPOWER_VAL 0x5444033d +#endif +#endif + + + + + + + + + + #endif /*__EXYNOS4412_SETUP__ */ diff --git a/include/configs/tiny4412.h b/include/configs/tiny4412.h index 36af8b1..281838d 100644 --- a/include/configs/tiny4412.h +++ b/include/configs/tiny4412.h @@ -3,6 +3,9 @@ * Author AP0904225 <ap0904225@qq.com> * * Configuration settings for the FriendlyARM TINY4412 (EXYNOS4412) board. + * FriendlyARM Tiny4412 SDK board hardware version: + * core board : Tiny4412-1412 + * bottom board : Tiny4412/Super4412SDK 1506 * * SPDX-License-Identifier: GPL-2.0+ */ @@ -21,11 +24,11 @@ #define CONFIG_SYS_DCACHE_OFF 1 -/* TINY4412 has 4 bank of DRAM */ -#define CONFIG_NR_DRAM_BANKS 4 +/* TINY4412-1412 core board has 8 bank of DRAM */ +#define CONFIG_NR_DRAM_BANKS 8 #define CONFIG_SYS_SDRAM_BASE 0x40000000 #define PHYS_SDRAM_1 CONFIG_SYS_SDRAM_BASE -#define SDRAM_BANK_SIZE (256 << 20) /* 256 MB */ +#define SDRAM_BANK_SIZE (128 << 20) /* 128 MB */ /* memtest works on */ #define CONFIG_SYS_MEMTEST_START CONFIG_SYS_SDRAM_BASE |
4、简单测试Tiny4412内存初始化是否正确
完成Exynos4412芯片DMC初始化相关步骤，我们要简单测试下内存是否已经可用。测试方法就是：往指定内存里面写一个值，然后再把该值读出来；如果写入和读取的值相同，就可以认为初始化的内存可以使用了。
测试代码如下：
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diff --git a/arch/arm/mach-exynos/lowlevel_init.c b/arch/arm/mach-exynos/lowlevel_init.c index 361727d..0e65242 100644 --- a/arch/arm/mach-exynos/lowlevel_init.c +++ b/arch/arm/mach-exynos/lowlevel_init.c @@ -229,7 +229,35 @@ int do_lowlevel_init(void) #endif #endif mem_ctrl_init(actions & DO_MEM_RESET); + + writel(0x44444444, 0x40000000); + if(readl(0x40000000) == 0x44444444) + printascii("addriss is :0x40000000 ;the value is 0x44444444.... !!!\n\r"); + + writel(0x55555555, 0x50000000); + if(readl(0x50000000) == 0x55555555) + printascii("addriss is :0x50000000 ;the value is 0x55555555.... !!!\n\r"); + + writel(0x22222222, 0x50000004); + if(readl(0x50000004) == 0x22222222) + printascii("addriss is :0x50000004 ;the value is 0x22222222.... !!!\n\r"); + + writel(0x66666666, 0x60000000); + if(readl(0x60000000) == 0x66666666) + printascii("addriss is :0x60000000 ;the value is 0x66666666.... !!!\n\r"); + + writel(0x77777777, 0x70000000); + if(readl(0x70000000) == 0x77777777) + printascii("addriss is :0x70000000 ;the value is 0x77777777.... !!!\n\r"); + + writel(0x88888888, 0x7FFFFFFC); + if(readl(0x7FFFFFFC) == 0x88888888) + printascii("addriss is :0x7FFFFFFC ;the value is 0x88888888.... !!!\n\r"); + + + #ifndef TINY4412 tzpc_init(); + #endif } return actions & DO_WAKEUP; |
编译代码下载到SD卡，从SD卡启动后，串口会打印出如下信息：
UART DEBUG enable .... !!!
addriss is :0x40000000 ;the value is 0x44444444.... !!!
addriss is :0x50000000 ;the value is 0x55555555.... !!!
addriss is :0x50000004 ;the value is 0x22222222.... !!!
addriss is :0x60000000 ;the value is 0x66666666.... !!!
addriss is :0x70000000 ;the value is 0x77777777.... !!!
addriss is :0x7FFFFFFC ;the value is 0x88888888.... !!!
这样可以初步判断从0x40000000 ~ 0x80000000之间的1G内存是可以使用的。
参考
1、《Exynos 4412 SCP_Users Manual_Ver.0.10.00_Preliminary.pdf》
2、tiny4412sdk-1506原生uboot卡死 http://www.cnblogs.com/kevinhwang/p/5617629.html
3、uboot_tiny4412-20130729
4、DDR3详解（以Micron MT41J128M8 1Gb DDR3 SDRAM为例）之一
http://blog.csdn.net/shanghaiqianlun/article/details/6976804
5、第八章、Tiny4412 U-BOOT移植八 SDRAM工作时序与原理
http://blog.csdn.net/eshing/article/details/37567337