iTop-4412精英版的u-boot-2017.11移植教程（三）
阿新 • • 發佈：2018-12-01
（一）修改clock.c
經過上面兩節的修改，我們發現還是有些問題，就是u-boot啟動後會停留在MMC: ，其實這是由於在clock.c檔案中關於mmc和lcd部分的結構體用錯了
exynos4_get_mmc_clk()
exynos4_set_mmc_clk()
exynos4_get_lcd_clk()
exynos4_set_lcd_clk()
根據文件資料，exynos4412晶片屬於4x12系列，而不是4系列，所以要改一下
（二）修改lowlevel_init.c
由於itop-4412開發板用的串列埠是串列埠2，所以改一下；還有就是tzpc的初始化，u-boot-2017.11預設的tzpc是exynos5系列晶片的，其實exynos4412已經有tzpc了，關於exynos的tzpc相關的知識，大家可以去網上學習，由於我移植的u-boot又不是用於高大上的商業機密啥的，就把它註釋了，如果自己想加上tzpc的話，自己參考訊為提供的三星原廠exynos4412晶片文件，在第14章
訊為提供的三星原廠exynos4412晶片文件第14章
（三）修改power.c
（1）為power.h檔案增加exynos4x12_power
這是由於exynos4412晶片屬於exynos4x12型別
這個結構體來源與訊為提供的三星原廠exynos4412晶片資料的8.8 Register Description
程式碼
struct exynos4x12_power {
unsigned int om_stat;
unsigned char res1[0xc];
unsigned int rtc_clko_sel;
unsigned
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（2）新增exynos4x12_set_ps_hold_ctrl函式，並修改set_ps_hold_ctrl
static void exynos4x12_set_ps_hold_ctrl(void)
{
struct exynos4x12_power *power =
(struct exynos4x12_power *)samsung_get_base_power();
/* value: 1000000000B */
setbits_le32(&power->ps_hold_control, EXYNOS_PS_HOLD_CONTROL_DATA_HIGH);
/**
* GPX0PUD register
*
* 0x0 = Disables Pull-up/Pull-down
* 0x1 = Enables Pull-down
* 0x2 = Reserved
* 0x3 = Enables Pull-up
*/
writel(0x3, (unsigned int *)0x11000c08);
}
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注：為啥要修改GPX0PUD暫存器呢？ 因為exynos4412 scp 核心板的電源管理是通過gpio來控制電源管理的，所以要將gpio設定為上拉
void set_ps_hold_ctrl(void)
{
if (cpu_is_exynos5())
exynos5_set_ps_hold_ctrl();
#ifdef CONFIG_ITOP4412
else if (cpu_is_exynos4())
exynos4x12_set_ps_hold_ctrl();
#endif
}
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（四）配置itop4412.h檔案了
/*
* Copyright (C) 2011 Samsung Electronics
*
* Configuration settings for the SAMSUNG ITOP4412 (EXYNOS4412) board.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __CONFIG_ITOP4412_H
#define __CONFIG_ITOP4412_H
#include <configs/exynos4-common.h>
#define CONFIG_SUPPORT_EMMC_BOOT 1
/* High Level Configuration Options */
#define CONFIG_EXYNOS4210 1 /* which is a EXYNOS4210 SoC */
#define CONFIG_ITOP4412 1 /* working with ITOP4412*/
#define CONFIG_SYS_DCACHE_OFF 1
/* itop-4412 has 4 bank of DRAM */
#define CONFIG_NR_DRAM_BANKS 4
#define CONFIG_SYS_SDRAM_BASE 0x40000000
#define PHYS_SDRAM_1 CONFIG_SYS_SDRAM_BASE
#define SDRAM_BANK_SIZE (256 << 20) /* 256 MB */
/* memtest works on */
#define CONFIG_SYS_MEMTEST_START CONFIG_SYS_SDRAM_BASE
#define CONFIG_SYS_MEMTEST_END (CONFIG_SYS_SDRAM_BASE + 0x6000000)
#define CONFIG_SYS_LOAD_ADDR (CONFIG_SYS_SDRAM_BASE + 0x00100000)
#define CONFIG_SYS_TEXT_BASE 0x43E00000
/* #define MACH_TYPE_ITOP4412 0xffffffff */
#define CONFIG_MACH_TYPE MACH_TYPE_ITOP4412
/* select serial console configuration */
#define CONFIG_SERIAL2
/* Console configuration */
#define CONFIG_DEFAULT_CONSOLE "console=ttySAC1,115200n8\0"
#define CONFIG_SYS_MEM_TOP_HIDE (1 << 20) /* ram console */
#define CONFIG_SYS_MONITOR_BASE 0x00000000
/* Power Down Modes */
#define S5P_CHECK_SLEEP 0x00000BAD
#define S5P_CHECK_DIDLE 0xBAD00000
#define S5P_CHECK_LPA 0xABAD0000
#define CONFIG_SUPPORT_RAW_INITRD
/* MMC SPL */
#define COPY_BL2_FNPTR_ADDR 0x02020030
#define CONFIG_SPL_TEXT_BASE 0x02023400 /* 0x02021410 */
#define CONFIG_EXTRA_ENV_SETTINGS \
"loadaddr=0x40007000\0" \
"rdaddr=0x48000000\0" \
"kerneladdr=0x40007000\0" \
"ramdiskaddr=0x48000000\0" \
"console=ttySAC2,115200n8\0" \
"mmcdev=0\0" \
"bootenv=uEnv.txt\0" \
"dtb_addr=0x41000000\0" \
"dtb_name=exynos4412-itop-4412.dtb\0" \
"loadbootenv=load mmc ${mmcdev} ${loadaddr} ${bootenv}\0" \
"bootargs=console=ttySAC2,115200n8 earlyprintk\0" \
"importbootenv=echo Importing environment from mmc ...; " \
"env import -t $loadaddr $filesize\0" \
"loadbootscript=load mmc ${mmcdev} ${loadaddr} boot.scr\0" \
"bootscript=echo Running bootscript from mmc${mmcdev} ...; " \
"source ${loadaddr}\0"
#define CONFIG_BOOTCOMMAND \
"if mmc rescan; then " \
"echo SD/MMC found on device ${mmcdev};" \
"if run loadbootenv; then " \
"echo Loaded environment from ${bootenv};" \
"run importbootenv;" \
"fi;" \
"if test -n $uenvcmd; then " \
"echo Running uenvcmd ...;" \
"run uenvcmd;" \
"fi;" \
"if run loadbootscript; then " \
"run bootscript; " \
"fi; " \
"fi;" \
"mmc read ${loadaddr} 0x1000 0x4000; mmc read ${dtb_addr} 0x800 0xa0; bootm ${loadaddr} - ${dtb_addr}" \
"load mmc ${mmcdev} ${loadaddr} uImage; load mmc ${mmcdev} ${dtb_addr} ${dtb_name}; bootm ${loadaddr} - ${dtb_addr}"
#define CONFIG_CLK_1000_400_200
/* MIU (Memory Interleaving Unit) */
#define CONFIG_MIU_2BIT_21_7_INTERLEAVED
#define CONFIG_SYS_MMC_ENV_DEV 0
#define CONFIG_ENV_SIZE (8 << 10) /* 16 KB */
#define RESERVE_BLOCK_SIZE (512)
#define BL1_SIZE (8 << 10) /*8 K reserved for BL1*/
#define BL2_SIZE (16 << 10) /*16 K reserved for BL2 */
#define CONFIG_ENV_OFFSET (RESERVE_BLOCK_SIZE + BL1_SIZE + BL2_SIZE)
#define CONFIG_SPL_MAX_FOOTPRINT (14 * 1024)
#define CONFIG_SPL_STACK 0x02040000
#define UBOOT_SIZE (2 << 20)
#define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_TEXT_BASE+UBOOT_SIZE-0x1000)
/* U-Boot copy size from boot Media to DRAM. */
#define COPY_BL2_SIZE 0x80000
#define BL2_START_OFFSET ((CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE)/512)
#define BL2_SIZE_BLOC_COUNT (COPY_BL2_SIZE/512)
#endif /* __CONFIG_H */
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（五）最後就是裝置樹檔案的編寫了
關於裝置樹檔案的編寫，網上也有很多資料可以查，我也就不詳細說明了(其實我也不太懂，只是弄個大概，反正u-boot的能正常執行就ok了)，廢話不多說，直接上程式碼，位置在arch/arm/dts/exynos4412-itop4412.dts
exynos4412-itop4412.dts
/*
* Odroid-U3/X2 board device tree source
*
* Copyright (c) 2014 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* SPDX-License-Identifier: GPL-2.0+
*/
/dts-v1/;
#include "exynos4412.dtsi"
/ {
model = "itop-4412 based on Exynos4412";
compatible = "samsung,itop-4412", "samsung,exynos4412";
aliases {
i2c0 = "/[email protected]";
i2c1 = "/[email protected]";
i2c2 = "/[email protected]";
i2c3 = "/[email protected]";
i2c4 = "/[email protected]";
i2c5 = "/[email protected]";
i2c6 = "/[email protected]";
i2c7 = "/[email protected]";
serial0 = "/[email protected]";
console = "/[email protected]";
mmc2 = "[email protected]";
mmc4 = "[email protected]";
};
[email protected]11c00000 {
compatible = "samsung,exynos-fimd";
reg = <0x11c00000 0xa4>;
samsung,vl-freq = <60>;
samsung,vl-col = <480>;
samsung,vl-row = <272>;
samsung,vl-width = <480>;
samsung,vl-height = <272>;
samsung,vl-clkp = <0>;
samsung,vl-oep = <0>;
samsung,vl-hsp = <1>;
samsung,vl-vsp = <0>;
samsung,vl-dp = <1>;
samsung,vl-bpix = <4>;
samsung,vl-hspw = <32>;
samsung,vl-hbpd = <80>;
samsung,vl-hfpd = <48>;
samsung,vl-vspw = <2>;
samsung,vl-vbpd = <1>;
samsung,vl-vfpd = <13>;
samsung,vl-cmd-allow-len = <0xf>;
samsung,winid = <0>;
samsung,power-on-delay = <30>;
samsung,interface-mode = <1>;
samsung,mipi-enabled = <0>;
//samsung,dp-enabled;
//samsung,dual-lcd-enabled;
samsung,logo-on = <1>;
samsung,resolution = <0>;
samsung,rgb-mode = <1>;
samsung,pwm-out-gpio = <&gpd0 1 1>;
samsung,bl-en-gpio = <&gpd0 0 1>;
};
[email protected]11c80000 {
compatible = "samsung,exynos-mipi-dsi";
reg = <0x11c80000 0x5c>;
samsung,dsim-config-e-interface = <1>;
samsung,dsim-config-e-virtual-ch = <0>;
samsung,dsim-config-e-pixel-format = <7>;
samsung,dsim-config-e-burst-mode = <1>;
samsung,dsim-config-e-no-data-lane = <3>;
samsung,dsim-config-e-byte-clk = <0>;
samsung,dsim-config-hfp = <1>;
samsung,dsim-config-p = <3>;
samsung,dsim-config-m = <120>;
samsung,dsim-config-s = <1>;
samsung,dsim-config-pll-stable-time = <500>;
samsung,dsim-config-esc-clk = <20000000>;
samsung,dsim-config-stop-holding-cnt = <0x7ff>;
samsung,dsim-config-bta-timeout = <0xff>;
samsung,dsim-config-rx-timeout = <0xffff>;
samsung,dsim-device-id = <0xffffffff>;
samsung,dsim-device-bus-id = <0>;
samsung,dsim-device-reverse-panel = <1>;
};
[email protected]13860000 {
samsung,i2c-sda-delay = <100>;
samsung,i2c-slave-addr = <0x10>;
samsung,i2c-max-bus-freq = <100000>;
status = "okay";
[email protected]09 {
compatible = "maxim,max77686_pmic";
interrupts = <7 0>;
reg = <0x09 0 0>;
#clock-cells = <1>;
};
};
[email protected]13820000 {
status = "okay";
};
[email protected]12510000 {
status = "disabled";
};
[email protected]12520000 {
status = "disabled";
};
[email protected]12530000 {
samsung,bus-width = <4>;
/*samsung,timing = <1 2 3>;*/
/*cd-gpios = <&gpk2 2 0>;*/
status = "okay";
};
[email protected]12540000 {
status = "disabled";
};
[email protected]12550000 {
samsung,bus-width = <4>;
samsung,timing = <2 1 0>;
samsung,removable = <0>;
fifoth_val = <0x203f0040>;
bus_hz = <400000000>;
div = <0x3>;
index = <4>;
};
[email protected]12580000 {
compatible = "samsung,exynos-ehci";
reg = <0x12580000 0x100>;
#address-cells = <1>;
#size-cells = <1>;
phy {
compatible = "samsung,exynos-usb-phy";
reg = <0x125B0000 0x100>;
};
};
emmc-reset {
compatible = "samsung,emmc-reset";
reset-gpio = <&gpk1 2<