已解决 水星 MW305R V3.1 刷 OP 之后无法进入串口控制台，但可从串口读取到启动信息

k92***

[20170402 更新]
问题已解决：原因是水星把 RX 那里的一个元器件（R23，猜测应该是一个限流电阻）给缩水掉了，后来直接短接就正常了。详细信息见 6 楼，里面有图片示例。

论坛中的大神帮我看看到底是哪里出问题了啊，无法通过串口进入交互式控制台。

设备：水星 MW305R V3.1
CPU：QCA9533
内存：64M
Flash：W25Q128
USB 转串口模块：Silicon Labs CP210x
固件下载地址：
https://downloads.openwrt.org/barrier_breaker/14.07/ar71xx/generic/
刷写固件名称：openwrt-ar71xx-generic-tl-wr841n-v9-squashfs-sysupgrade.bin
问题描述：
    1. 连接串口后可以读取到启动信息，但是在启动完毕之后按回车无法进入交互式控制台。
    2. 可以确定路由器工作一切正常也能通过 SSH 连接进入控制台，但是串口下始终无法进入控制台。
    3. 尝试更换 USB 转串口模块，问题未解决。
    4. 尝试拆掉 USB 转串口模块上 TX 和 RX 的状态指示 LED，问题未解决。
    5. 尝试刷 OpenWrt CC 固件，问题未解决。
    6. 断电重启启动几十次，问题未解决。
下面是启动时的输出信息：

1. 
   
2. 
   
3. U-Boot 1.1.4 (Jun 10 2014 - 12:45:22)
   
4. 
   
5. AP143 (QCA953x - Honey Bee 1.1) U-Boot
   
6. DRAM:  64 MB
   
7. Flash: Winbond W25Q128 (16 MB)
   
8. Using default environment
   
9. 
   
10. Clocks: CPU:550MHz, DDR:400MHz, AHB:200MHz, Ref:25MHz
    
11. In:    serial
    
12. Out:   serial
    
13. Err:   serial
    
14. Net:   ath_gmac_enet_initialize...
    
15. Fetching MAC Address from 0xbf01fc00
    
16. Fetching MAC Address from 0xbf01fc00
    
17. Scorpion ----> S27 PHY*
    
18. S27 reg init
    
19. GMAC: cfg1 0x800c0000 cfg2 0x7114
    
20. eth0: c0:3c:44:a5:66:01
    
21. eth0 up
    
22. Honey Bee ----> MAC 1 S27 PHY*
    
23. S27 reg init
    
24. ATHRS27: resetting s27
    
25. ATHRS27: s27 reset done
    
26. GMAC: cfg1 0x800c0000 cfg2 0x7214
    
27. eth1: c0:3c:44:a5:66:02
    
28. eth1 up
    
29. eth0, eth1
    
30. Hit any key to stop autoboot:  0
    
31. ## Booting image at 9f020000 ...
    
32.    Image Name:   Unknown board (08410009)
    
33.    Created:      1970-01-01   0:00:00 UTC
    
34.    Image Type:   MIPS Linux Kernel Image (lzma compressed)
    
35.    Data Size:    3931648 Bytes =  3.7 MB
    
36.    Load Address: 80060000
    
37.    Entry Point:  80060000
    
38.    Uncompressing Kernel Image ... OK
    
39. 
    
40. Starting kernel ...
    
41. 
    
42. [    0.000000] Linux version 3.10.49 (bb@builder1) (gcc version 4.8.3 (OpenWrt/Linaro GCC 4.8-2014.04 r42625) ) #3 Wed Oct 1 14:00:51 CEST 2014
    
43. [    0.000000] bootconsole [early0] enabled
    
44. [    0.000000] CPU revision is: 00019374 (MIPS 24Kc)
    
45. [    0.000000] SoC: Qualcomm Atheros QCA9533 rev 1
    
46. [    0.000000] Clocks: CPU:550.000MHz, DDR:423.535MHz, AHB:211.767MHz, Ref:25.000MHz
    
47. [    0.000000] Determined physical RAM map:
    
48. [    0.000000]  memory: 04000000 @ 00000000 (usable)
    
49. [    0.000000] Initrd not found or empty - disabling initrd
    
50. [    0.000000] Zone ranges:
    
51. [    0.000000]   Normal   [mem 0x00000000-0x03ffffff]
    
52. [    0.000000] Movable zone start for each node
    
53. [    0.000000] Early memory node ranges
    
54. [    0.000000]   node   0: [mem 0x00000000-0x03ffffff]
    
55. [    0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes.
    
56. [    0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases, linesize 32 bytes
    
57. [    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 16256
    
58. [    0.000000] Kernel command line:  board=TL-WR841N-v9 console=ttyS0,115200 rootfstype=squashfs,jffs2 noinitrd
    
59. [    0.000000] PID hash table entries: 256 (order: -2, 1024 bytes)
    
60. [    0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
    
61. [    0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
    
62. [    0.000000] Writing ErrCtl register=00000000
    
63. [    0.000000] Readback ErrCtl register=00000000
    
64. [    0.000000] Memory: 61076k/65536k available (2369k kernel code, 4460k reserved, 621k data, 272k init, 0k highmem)
    
65. [    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
    
66. [    0.000000] NR_IRQS:51
    
67. [    0.000000] Calibrating delay loop... 366.18 BogoMIPS (lpj=1830912)
    
68. [    0.060000] pid_max: default: 32768 minimum: 301
    
69. [    0.060000] Mount-cache hash table entries: 512
    
70. [    0.070000] NET: Registered protocol family 16
    
71. [    0.070000] MIPS: machine is TP-LINK TL-WR841N/ND v9
    
72. [    0.490000] bio: create slab <bio-0> at 0
    
73. [    0.500000] Switching to clocksource MIPS
    
74. [    0.500000] NET: Registered protocol family 2
    
75. [    0.510000] TCP established hash table entries: 512 (order: 0, 4096 bytes)
    
76. [    0.510000] TCP bind hash table entries: 512 (order: -1, 2048 bytes)
    
77. [    0.520000] TCP: Hash tables configured (established 512 bind 512)
    
78. [    0.520000] TCP: reno registered
    
79. [    0.530000] UDP hash table entries: 256 (order: 0, 4096 bytes)
    
80. [    0.530000] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
    
81. [    0.540000] NET: Registered protocol family 1
    
82. [    0.560000] squashfs: version 4.0 (2009/01/31) Phillip Lougher
    
83. [    0.570000] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
    
84. [    0.580000] msgmni has been set to 119
    
85. [    0.580000] io scheduler noop registered
    
86. [    0.580000] io scheduler deadline registered (default)
    
87. [    0.590000] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
    
88. [    0.620000] serial8250.0: ttyS0 at MMIO 0x18020000 (irq = 11) is a 16550A
    
89. [    0.630000] console [ttyS0] enabled, bootconsole disabled
    
90. [    0.630000] console [ttyS0] enabled, bootconsole disabled
    
91. [    0.640000] ath79-spi ath79-spi: master is unqueued, this is deprecated
    
92. [    0.650000] m25p80 spi0.0: found w25q128, expected m25p80
    
93. [    0.660000] m25p80 spi0.0: w25q128 (16384 Kbytes)
    
94. [    0.660000] 5 tp-link partitions found on MTD device spi0.0
    
95. [    0.670000] Creating 5 MTD partitions on "spi0.0":
    
96. [    0.670000] 0x000000000000-0x000000020000 : "u-boot"
    
97. [    0.680000] 0x000000020000-0x00000012e660 : "kernel"
    
98. [    0.680000] mtd: partition "kernel" must either start or end on erase block boundary or be smaller than an erase block -- forcing read-only
    
99. [    0.700000] 0x00000012e660-0x000000ff0000 : "rootfs"
    
100. [    0.700000] mtd: partition "rootfs" must either start or end on erase block boundary or be smaller than an erase block -- forcing read-only
     
101. [    0.720000] mtd: device 2 (rootfs) set to be root filesystem
     
102. [    0.730000] 1 squashfs-split partitions found on MTD device rootfs
     
103. [    0.730000] 0x000000340000-0x000000ff0000 : "rootfs_data"
     
104. [    0.740000] 0x000000ff0000-0x000001000000 : "art"
     
105. [    0.750000] 0x000000020000-0x000000ff0000 : "firmware"
     
106. [    0.770000] libphy: ag71xx_mdio: probed
     
107. [    1.330000] ag71xx-mdio.1: Found an AR934X built-in switch
     
108. [    2.370000] eth0: Atheros AG71xx at 0xba000000, irq 5, mode:GMII
     
109. [    2.930000] ag71xx ag71xx.0: connected to PHY at ag71xx-mdio.1:04 [uid=004dd042, driver=Generic PHY]
     
110. [    2.940000] eth1: Atheros AG71xx at 0xb9000000, irq 4, mode:MII
     
111. [    2.950000] TCP: cubic registered
     
112. [    2.950000] NET: Registered protocol family 17
     
113. [    2.950000] Bridge firewalling registered
     
114. [    2.960000] 8021q: 802.1Q VLAN Support v1.8
     
115. [    2.970000] VFS: Mounted root (squashfs filesystem) readonly on device 31:2.
     
116. [    2.980000] Freeing unused kernel memory: 272K (8034c000 - 80390000)
     
117. procd: Console is alive
     
118. procd: - watchdog -
     
119. procd: - preinit -
     
120. Press the [f] key and hit [enter] to enter failsafe mode
     
121. Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level
     
122. jffs2 is ready
     
123. jffs2 is ready
     
124. [    9.970000] jffs2: notice: (321) jffs2_build_xattr_subsystem: complete building xattr subsystem, 1 of xdatum (0 unchecked, 0 orphan) and 16 of xref (0 dead, 2 orphan) found.
     
125. switching to overlay
     
126. procd: - early -
     
127. procd: - watchdog -
     
128. procd: - ubus -
     
129. procd: - init -
     
130. Please press Enter to activate this console.
     
131. [   11.460000] NET: Registered protocol family 10
     
132. [   11.470000] nf_conntrack version 0.5.0 (958 buckets, 3832 max)
     
133. [   11.490000] ip6_tables: (C) 2000-2006 Netfilter Core Team
     
134. [   11.500000] Loading modules backported from Linux version master-2014-05-22-0-gf2032ea
     
135. [   11.510000] Backport generated by backports.git backports-20140320-37-g5c33da0
     
136. [   11.520000] ip_tables: (C) 2000-2006 Netfilter Core Team
     
137. [   11.570000] xt_time: kernel timezone is -0000
     
138. [   11.620000] cfg80211: Calling CRDA to update world regulatory domain
     
139. [   11.640000] cfg80211: World regulatory domain updated:
     
140. [   11.640000] cfg80211:  DFS Master region: unset
     
141. [   11.650000] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
     
142. [   11.660000] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
     
143. [   11.660000] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
     
144. [   11.670000] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (N/A, 2000 mBm), (N/A)
     
145. [   11.680000] cfg80211:   (5170000 KHz - 5250000 KHz @ 160000 KHz), (N/A, 2000 mBm), (N/A)
     
146. [   11.690000] cfg80211:   (5250000 KHz - 5330000 KHz @ 160000 KHz), (N/A, 2000 mBm), (0 s)
     
147. [   11.700000] cfg80211:   (5490000 KHz - 5730000 KHz @ 160000 KHz), (N/A, 2000 mBm), (0 s)
     
148. [   11.710000] cfg80211:   (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A, 2000 mBm), (N/A)
     
149. [   11.710000] cfg80211:   (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 0 mBm), (N/A)
     
150. [   11.730000] PPP generic driver version 2.4.2
     
151. [   11.740000] NET: Registered protocol family 24
     
152. [   11.830000] ieee80211 phy0: Atheros AR9531 Rev:1 mem=0xb8100000, irq=2
     
153. [   11.840000] cfg80211: Calling CRDA for country: US
     
154. [   11.840000] cfg80211: Regulatory domain changed to country: US
     
155. [   11.850000] cfg80211:  DFS Master region: FCC
     
156. [   11.850000] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
     
157. [   11.860000] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A, 3000 mBm), (N/A)
     
158. [   11.870000] cfg80211:   (5170000 KHz - 5250000 KHz @ 80000 KHz), (N/A, 1700 mBm), (N/A)
     
159. [   11.880000] cfg80211:   (5250000 KHz - 5330000 KHz @ 80000 KHz), (N/A, 2300 mBm), (0 s)
     
160. [   11.890000] cfg80211:   (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A, 3000 mBm), (N/A)
     
161. [   11.900000] cfg80211:   (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 4000 mBm), (N/A)
     
162. procd: - init complete -
     
163. [   21.380000] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
     
164. [   21.380000] device eth0 entered promiscuous mode
     
165. [   21.390000] IPv6: ADDRCONF(NETDEV_UP): br-lan: link is not ready
     
166. [   21.420000] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready
     

复制代码

k92***

自己顶一下

k92***

自己顶一下

Ruc***

Press the [f] key and hit [enter] to enter failsafe mode
显示到这一行时按键盘 f 并回车看看能不能进安全模式，如果没反应检查连线

k92***

Ruckus 发表于 2017-3-27 22:04
Press the [f] key and hit [enter] to enter failsafe mode
显示到这一行时按键盘 f 并回车看看能不能进 ...

谢谢哥们，问题找到了，确实是硬件连接的问题。水星把板子上 RX 那里的一个元器件给缩水掉了，我后来直接把那个缩水掉元器件的两个焊点短接起来就 OK 了。

k92***

问题已解决。后来重新买了一个这个路由器，仔细观察发现水星把板子上 RX 那里（R23）的一个元器件给缩水掉了，我后来直接把那个缩水掉元器件的两个焊点短接起来就 OK 了。详细信息见下图：

k92***

另外，H 大的这番话也印证了我的想法。

首先，你的输入不起作用那是因为tp省成本没有给你的ttl接口的rx连接电阻，所以无法输入
自己检查ttl接口附近处有没有缺少电阻，有空余的电阻位，有的话就自己加上22Ω的电阻或者短接

帖子地址：https://www.right.com.cn/forum/fo ... &page=66#pid1083611

Mei***

mw305 ver3.1版刷第三方需不需要硬改

k92***

Mei小狼 发表于 2020-7-15 18:27
mw305 ver3.1版刷第三方需不需要硬改

拆开看下板子，拍照发出来