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TP-LINK 845N V1硬改16M Flash，64M RAM，刮U刷OpenWRT

发布时间：2020-12-15 07:06:12 所属栏目：百科 来源：网络整理
导读：? ? ??TP-LINK 845N V1与TP-LINK 841N V8硬件部分基本一样，差别在于Flash、RAM容量。手头的TP-LINK 845N V1的Flash是2M的Winbond 25Q16BVSIG，RAM是16M的Zentel A3S28D40FTP-G5。平常运行不算稳定，特别夏天的时候无线很容易挂掉。学了一段时间OpenWRT以后

? ? ??TP-LINK 845N V1与TP-LINK 841N V8硬件部分基本一样，差别在于Flash、RAM容量。手头的TP-LINK 845N V1的Flash是2M的Winbond 25Q16BVSIG，RAM是16M的Zentel A3S28D40FTP-G5。平常运行不算稳定，特别夏天的时候无线很容易挂掉。学了一段时间OpenWRT以后决定对路由器进行软硬件方面的修改。硬件方面把RAM换成64M的HY5DU121622DTP-D43，Flash换成16M的MX25L12835F，引出USB接口，USB供电使用LM2596可调降压模块。软件方面自己ubuntu下修改编译支持845N V1的OpenWRT固件。

一、硬改部分

? ? 先换内存，换上以后再测试是否还能正常启动，如果不能正常启动有可能是内存芯片没焊好，还有可能是电路板少了R63这颗贴片电阻。因当时焊了几次内存都不行，google了下845N V1的拆机图，跟图对比的下发现少了R63这个电阻，阻值不清楚，参考R62阻值51Ω，焊到R63上，结果开机OK。（手头的贴片电阻没那么小的，用了一个大一点点的贴片电阻+0Ω电阻立起来焊接），如下图：


? ? ? 内存换成功以后，就可以开始换Flash。先拆掉原来的flash芯片，用CH341A编程器读出原有的固件。目的是要得到art无线校正数据。为了无线能正常工作，art数据是必须的，art数据在原固件的最后64KiB部分。然后编译出来的uboot、openwrt factory固件、art数据合成一个完整的16MiB的编程器固件（uboot、openwrt编译以及合并成编程器固件见第二部分），用编程器刷入flash芯片换上。正常无误的话上电就能启动openwrt系统了。

? ? ?接着就是刮出USB的D+、D-引线。取下散热片。845N V1用的CPU是AR9341。查datasheet和网络上找的图，确定usb引脚的位置，如下图：




用美工刀慢慢的刮，本人第一次刮没什么经验，花了2个钟头才刮好。挖开后，用0.1毫米的漆包线焊接，将D+、D-引出。注意：引脚非常小，焊完用万用表量下是否短路或者是否有焊接上。D+、D-跟D-旁边那根线间电阻，本人量的下貌似都是几兆欧。


引出usb数据线后，接上LM2596电源模块和USB母口，USB母口的外壳接地，调整usb电源模块输出5V。接线图如下：

usb的D+、D-引出后，换好点的粗线，然后热熔胶粘上：

最后整体图：

接线都完成后，上电待系统启动完成，ssh登录路由。插上u盘，ls /dev看看有没有识别到u盘。也可以用dmesg命令查看内核调试信息，这之中就有会有跟usb相关的信息。


二、软改部分

? ? ?OpenWRT没有原生支持TP-LINK 845N V1，只因Flash、RAM太小了。因此软件部分必须自己修改编译。从svn co svn://svn.openwrt.org/openwrt/trunk/下载源码。版本r40804。2014年5月21日下载好的。

2.1、修改target/linux/ar71xx/generic/profiles/tp-link.mk，找到$(eval $(call Profile,TLWR842))，在此之下添加： 

define Profile/TLWR845
	NAME:=TP-LINK TL-WR845N
	PACKAGES:=kmod-usb-core kmod-usb2 kmod-ledtrig-usbdev
endef

define Profile/TLWR845/Description
	Package set optimized for the TP-LINK TL-WR845N.
endef
$(eval $(call Profile,TLWR845))

2.2、修改target/linux/ar71xx/base-files/lib/ar71xx.sh，找到 

"084200"*)
 		model="TP-Link TL-WR842N/ND"
 		;;
在此之下添加： 
"084500"*)
		model="TP-Link TL-WR845N"
		;;
再找到： 
*"TL-WR842N/ND v2")
 		name="tl-wr842n-v2"
 		;;
在此之下添加： 
*"TL-WR845N v1")
		name="tl-wr845n-v1"
		;;

2.3、修改target/linux/ar71xx/base-files/lib/upgrade/platform.sh，找到 

tl-wr841n-v8 | 
	tl-wr841n-v9 | 
	tl-wr842n-v2 |

在此之下添加： 

tl-wr845n-v1 |

2.4、修改arget/linux/ar71xx/base-files/etc/uci-defaults/01_leds，找到 

tl-wa801nd-v2 | 
tl-wa901nd-v3)

在此之上（是这之上），添加 

tl-wr845n-v1)
	ucidef_set_led_netdev "wan" "WAN" "tp-link:green:wan" "eth0"
	ucidef_set_led_switch "lan1" "LAN1" "tp-link:green:lan1" "switch0" "0x02"
	ucidef_set_led_switch "lan2" "LAN2" "tp-link:green:lan2" "switch0" "0x04"
	ucidef_set_led_switch "lan3" "LAN3" "tp-link:green:lan3" "switch0" "0x08"
	ucidef_set_led_switch "lan4" "LAN4" "tp-link:green:lan4" "switch0" "0x10"
	ucidef_set_led_wlan "wlan" "WLAN" "tp-link:green:wlan" "phy0tpt"
	ucidef_set_led_usbdev "usb" "USB" "tp-link:green:qss" "1-1"
	;;
注：这里用845N V1的QSS那个灯（就是最后一个锁标志的那个）来当USB的指示灯。因刷openwrt后qss灯基本没有用处，因此可以当usb指示灯用。另外lan1、lan2、lan3、lan4的端口顺序依次是0x02、0x04、0x08、0x10，否则导致led灯与路由器后面的wan、lan口对应不上。部分信息可参看后面的mach-tl-wr845n-v1.c文件。

2.5、修改target/linux/ar71xx/base-files/etc/uci-defaults/02_network，找到 

tl-mr3420-v2 |
tl-wr841n-v8 |
tl-wr842n-v2 |
在此之下添加 
tl-wr845n-v1 |

2.6、修改target/linux/ar71xx/base-files/etc/diag.sh，找到 

tl-wr841n-v7 | 
	tl-wr841n-v8 | 
	tl-wr842n-v2 |

在此之下添加 

tl-wr845n-v1 |
2.7、修改target/linux/ar71xx/image/Makefile，找到 
$(eval $(call SingleProfile,TPLINK-LZMA,64kraw,TLWR841NV8,tl-wr841n-v8,TL-WR841N-v8,ttyS0,115200,0x08410008,1,4Mlzma))
$(eval $(call SingleProfile,TLWR841NV9,tl-wr841n-v9,TL-WR841N-v9,0x08410009,TLWR842V2,tl-wr842n-v2,TL-WR842N-v2,0x8420002,8Mlzma))
在此之下添加 
$(eval $(call SingleProfile,TLWR845V1,tl-wr845n-v1,TL-WR845N-v1,0x8450001,16Mlzma)
注：因使用的是16M的Flash，所以是16Mlzma。然后再找到 
$(eval $(call MultiProfile,TLWR743,TLWR743NV1 TLWR743NV2))
$(eval $(call MultiProfile,TLWR841,TLWR841NV15 TLWR841NV3 TLWR841NV5 TLWR841NV7 TLWR841NV8 TLWR841NV9))
$(eval $(call MultiProfile,TLWR842,TLWR842V1 TLWR842V2))
在此之下添加 
$(eval $(call MultiProfile,TLWR845,TLWR845V1))

2.8、修改target/linux/ar71xx/base-files/lib/preinit/05_set_preinit_iface_ar71xx，找到 

tl-wr720n-v3 |
	tl-wr841n-v8 |
	tl-wr842n-v2 |

在此之下添加 

tl-wr845n-v1 |
2.9、修改target/linux/ar71xx/config-3.10，找到 
CONFIG_ATH79_MACH_TL_WR841N_V1=y
CONFIG_ATH79_MACH_TL_WR841N_V8=y
CONFIG_ATH79_MACH_TL_WR841N_V9=y
在此之下添加 
CONFIG_ATH79_MACH_TL_WR845N_V1=y

2.10、在target/linux/ar71xx/files/arch/mips/ath79/下新建文件mach-tl-wr845n-v1.c，文件内容如下： 

/*
 *  TP-LINK TL-WR845N v1 board support
 *
 *  Copyright (C) 2012 Gabor Juhos <juhosg@openwrt.org>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License version 2 as published
 *  by the Free Software Foundation.
 */

#include <linux/gpio.h>
#include <linux/platform_device.h>

#include <asm/mach-ath79/ath79.h>
#include <asm/mach-ath79/ar71xx_regs.h>

#include "common.h"
#include "dev-eth.h"
#include "dev-gpio-buttons.h"
#include "dev-leds-gpio.h"
#include "dev-m25p80.h"
#include "dev-usb.h"
#include "dev-wmac.h"
#include "machtypes.h"

#define TL_WR845NV1_GPIO_LED_WLAN	13
#define TL_WR845NV1_GPIO_LED_QSS	15
#define TL_WR845NV1_GPIO_LED_WAN	18
#define TL_WR845NV1_GPIO_LED_LAN1	19
#define TL_WR845NV1_GPIO_LED_LAN2	20
#define TL_WR845NV1_GPIO_LED_LAN3	21
#define TL_WR845NV1_GPIO_LED_LAN4	12
#define TL_WR845NV1_GPIO_LED_SYSTEM	14

#define TL_WR845NV1_GPIO_BTN_RESET	17
#define TL_WR845NV1_GPIO_SW_RFKILL	16	/* WPS for MR3420 v2 */

#define TL_MR3420V2_GPIO_LED_3G	11
#define TL_MR3420V2_GPIO_USB_POWER	4

#define TL_WR845NV1_KEYS_POLL_INTERVAL	20	/* msecs */
#define TL_WR845NV1_KEYS_DEBOUNCE_INTERVAL (3 * TL_WR845NV1_KEYS_POLL_INTERVAL)

static const char *tl_wr845n_v1_part_probes[] = {
	"tp-link",NULL,};

static struct flash_platform_data tl_wr845n_v1_flash_data = {
	.part_probes	= tl_wr845n_v1_part_probes,};

static struct gpio_led tl_wr845n_v1_leds_gpio[] __initdata = {
	{
		.name		= "tp-link:green:lan1",.gpio		= TL_WR845NV1_GPIO_LED_LAN1,.active_low	= 1,},{
		.name		= "tp-link:green:lan2",.gpio		= TL_WR845NV1_GPIO_LED_LAN2,{
		.name		= "tp-link:green:lan3",.gpio		= TL_WR845NV1_GPIO_LED_LAN3,{
		.name		= "tp-link:green:lan4",.gpio		= TL_WR845NV1_GPIO_LED_LAN4,{
		.name		= "tp-link:green:qss",.gpio		= TL_WR845NV1_GPIO_LED_QSS,{
		.name		= "tp-link:green:system",.gpio		= TL_WR845NV1_GPIO_LED_SYSTEM,{
		.name		= "tp-link:green:wan",.gpio		= TL_WR845NV1_GPIO_LED_WAN,{
		.name		= "tp-link:green:wlan",.gpio		= TL_WR845NV1_GPIO_LED_WLAN,}
};

static struct gpio_keys_button tl_wr845n_v1_gpio_keys[] __initdata = {
	{
		.desc		= "Reset button",//QSS/RESET按钮
		.type		= EV_KEY,.code		= KEY_RESTART,.debounce_interval = TL_WR845NV1_KEYS_DEBOUNCE_INTERVAL,.gpio		= TL_WR845NV1_GPIO_BTN_RESET,}
};

static void __init tl_ap123_setup(void)
{
	u8 *mac = (u8 *) KSEG1ADDR(0x1f01fc00);
	u8 *ee = (u8 *) KSEG1ADDR(0x1fff1000);

	/* Disable JTAG,enabling GPIOs 0-3 */
	/* Configure OBS4 line,for GPIO 4*/
	ath79_gpio_function_setup(AR934X_GPIO_FUNC_JTAG_DISABLE,AR934X_GPIO_FUNC_CLK_OBS4_EN);

	/* config gpio4 as normal gpio function */
	ath79_gpio_output_select(TL_MR3420V2_GPIO_USB_POWER,AR934X_GPIO_OUT_GPIO);

	ath79_register_m25p80(&tl_wr845n_v1_flash_data);

	ath79_setup_ar934x_eth_cfg(AR934X_ETH_CFG_SW_ONLY_MODE); //改AR934X_ETH_CFG_SW_PHY_SWAP为AR934X_ETH_CFG_SW_ONLY_MODE

	ath79_register_mdio(1,0x0);

	ath79_init_mac(ath79_eth0_data.mac_addr,mac,-1);
	ath79_init_mac(ath79_eth1_data.mac_addr,0);

	/* GMAC0 is connected to the PHY0 of the internal switch */
	//修正lan1会变成wan，lan2变成lan1，wan口变成lan4的问题。
	ath79_switch_data.phy4_mii_en = 1;
	ath79_switch_data.phy_poll_mask = BIT(4);
	ath79_eth0_data.phy_if_mode = PHY_INTERFACE_MODE_MII;
	ath79_eth0_data.phy_mask = BIT(4);
	ath79_eth0_data.mii_bus_dev = &ath79_mdio1_device.dev;
	ath79_register_eth(0);

	/* GMAC1 is connected to the internal switch */
	ath79_eth1_data.phy_if_mode = PHY_INTERFACE_MODE_GMII;
	ath79_register_eth(1);

	ath79_register_wmac(ee,mac);
}

static void __init tl_wr845n_v1_setup(void)
{
	tl_ap123_setup();

	ath79_register_leds_gpio(-1,ARRAY_SIZE(tl_wr845n_v1_leds_gpio),tl_wr845n_v1_leds_gpio);

	ath79_register_gpio_keys_polled(1,TL_WR845NV1_KEYS_POLL_INTERVAL,ARRAY_SIZE(tl_wr845n_v1_gpio_keys),tl_wr845n_v1_gpio_keys);

	/* enable power for the USB port */
	gpio_request_one(TL_MR3420V2_GPIO_USB_POWER,GPIOF_OUT_INIT_HIGH | GPIOF_EXPORT_DIR_FIXED,"USB power");

	ath79_register_usb(); //加上，我们要usb功能
}

MIPS_MACHINE(ATH79_MACH_TL_WR845N_V1,"TL-WR845N-v1","TP-LINK TL-WR845N v1",tl_wr845n_v1_setup);

2.11、修改tools/firmware-utils/src/mktplinkfw.c，添加“HWID_TL_WR845N_V1”宏定义，然后将16M的布局中的fw_max_len都改成0xfc0000，如下所示： 

#define HWID_TL_WR845N_V1	0x08450001
},{
		.id		= "16M",.fw_max_len	= 0xfc0000,.kernel_la	= 0x80060000,.kernel_ep	= 0x80060000,.rootfs_ofs	= 0x140000,{
		.id		= "16Mlzma",.rootfs_ofs	= 0x100000,{
		.id		= "16Mppc",.kernel_la	= 0x00000000,.kernel_ep	= 0xc0000000,.rootfs_ofs	= 0x2a0000,{
		/* terminating entry */
	}
然后再在boards数组中找到 
{
		.id		= "TL-WR941NDv2",.hw_id		= HWID_TL_WR941ND_V2,.hw_rev	= 2,

在此之上（注：之上）添加一条845Nv1相关部分的代码，修改后如下： 

},{
		.id		= "TL-WR841NDv7",.hw_id		= HWID_TL_WR841ND_V7,.hw_rev		= 1,.layout_id	= "4M",{
		.id		= "TL-WR845Nv1",.hw_id		= HWID_TL_WR845N_V1,.layout_id	= "16Mlzma",{
		.id		= "TL-WR941NDv2",.hw_rev		= 2,{
2.12、在target/linux/ar71xx/patches-3.10/下创建文件999-MIPS-ath79-add-845nv1-support.patch，文件内容如下： 
--- a/arch/mips/ath79/Kconfig	2014-05-29 10:36:56.000000000 +0800
+++ b/arch/mips/ath79/Kconfig	2014-05-30 09:08:42.699124426 +0800
@@ -725,6 +725,16 @@
        select ATH79_DEV_M25P80
        select ATH79_DEV_WMAC
 
+config ATH79_MACH_TL_WR845N_V1
+	bool "TP-LINK TL-WR845N v1 support"
+	select SOC_AR934X
+	select ATH79_DEV_ETH
+	select ATH79_DEV_GPIO_BUTTONS
+	select ATH79_DEV_LEDS_GPIO
+	select ATH79_DEV_M25P80
+	select ATH79_DEV_USB
+	select ATH79_DEV_WMAC
+
 config ATH79_MACH_TL_WR941ND
 	bool "TP-LINK TL-WR941ND support"
 	select SOC_AR913X
--- a/arch/mips/ath79/machtypes.h	2014-05-29 10:36:56.000000000 +0800
+++ b/arch/mips/ath79/machtypes.h	2014-05-30 09:10:35.431127534 +0800
@@ -126,6 +126,7 @@
 	ATH79_MACH_TL_WR841N_V8,/* TP-LINK TL-WR841N/ND v8 */
 	ATH79_MACH_TL_WR841N_V9,/* TP-LINK TL-WR841N/ND v9 */
 	ATH79_MACH_TL_WR842N_V2,/* TP-LINK TL-WR842N/ND v2 */
+	ATH79_MACH_TL_WR845N_V1,/* TP-LINK TL-WR845N v1 */
 	ATH79_MACH_TL_WR941ND,/* TP-LINK TL-WR941ND */
 	ATH79_MACH_UBNT_AIRROUTER,/* Ubiquiti AirRouter */
 	ATH79_MACH_UBNT_BULLET_M,/* Ubiquiti Bullet M */
--- a/arch/mips/ath79/Makefile	2014-05-29 10:36:56.000000000 +0800
+++ b/arch/mips/ath79/Makefile	2014-05-30 09:18:14.711140199 +0800
@@ -101,6 +101,7 @@
 obj-$(CONFIG_ATH79_MACH_TL_WR841N_V1)	+= mach-tl-wr841n.o
 obj-$(CONFIG_ATH79_MACH_TL_WR841N_V8)	+= mach-tl-wr841n-v8.o
 obj-$(CONFIG_ATH79_MACH_TL_WR841N_V9)	+= mach-tl-wr841n-v9.o
+obj-$(CONFIG_ATH79_MACH_TL_WR845N_V1)	+= mach-tl-wr845n-v1.o
 obj-$(CONFIG_ATH79_MACH_TL_WR941ND)	+= mach-tl-wr941nd.o
 obj-$(CONFIG_ATH79_MACH_TL_WR1041N_V2)	+= mach-tl-wr1041n-v2.o
 obj-$(CONFIG_ATH79_MACH_TL_WR1043ND)	+= mach-tl-wr1043nd.o


至此文件都修改完成。make menuconfig，对编译前进行配置。把Build the OpenWrt based Toolchain选上，在编译uboot要用的到。其他可选的软件包可以参考《编译HG255D的openwrt固件》，选好之后make V=s编译。编译完成后在bin/ar71xx/会得到openwrt-ar71xx-generic-tl-wr845n-v1-squashfs-factory.bin和openwrt-ar71xx-generic-tl-wr845n-v1-squashfs-sysupgrade.bin，前者在制作编程器固件会用到，后者在以后对openwrt系统升级会用到。还有一个OpenWrt-Toolchain-ar71xx-for-mips_34kc-gcc-4.8-linaro_uClibc-0.9.33.2.tar.bz2，这个在编译uboot会用到。其他的文件不用理会。

有了OpenWrt-Toolchain-ar71xx-for-mips_34kc-gcc-4.8-linaro_uClibc-0.9.33.2.tar.bz2就可以编译uboot了，去下载u-boot_mod源码https://github.com/pepe2k/u-boot_mod，在u-boot_mod源码下创建toolchain目录，把OpenWrt-Toolchain-ar71xx-for-mips_34kc-gcc-4.8-linaro_uClibc-0.9.33.2.tar.bz2解压到此toolchain目录下，如图


修改u-boot_mod目录下的Makefile文件，找到 

export MAKECMD=make --silent ARCH=mips CROSS_COMPILE=mips-linux-gnu-
修改添加 

export MAKECMD=make --silent ARCH=mips CROSS_COMPILE=mips-openwrt-linux-uclibc-
export PATH:=$(BUILD_TOPDIR)/toolchain/bin/:$(PATH)
然后make?tplink_wr841n_v8编译uboot固件，得到uboot_for_tp-link_tl-wr841n_v8.bin文件，大小64KiB。


三、制作编程器固件

拷贝uboot_for_tp-link_tl-wr841n_v8.bin为uboot.bin并用0xFF填充成128KiB大小。在0x1fc00处填入6字节原路由器的mac地址。在0x1fd00处填入8字节数据08 45 00 01 00 00 00 01。在0x1fe00处填入原路由的pin码字符串（8字节）。845n v1的编程器固件=uboot.bin(128k)+openwrt-ar71xx-generic-tl-wr845n-v1-squashfs-factory.bin(16128k)+64k的0xFF填充+64k原路由的art，得到的固件刚好16M，直接用编程器烧录Flash芯片。


四、OpenWrt运行图




（编辑：李大同）

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