N305RE 升级 64MB RAM
前言
看此篇文章时，请确定您理解以下相关资讯
文章介绍升级的过程有极大的硬体损坏、软体变砖的风险，请自行评估是否有能力完成再执行。
升级RAM
首先将原本的DDR 32MB(16Mx16bitsx4banks)记忆体更换为DDR 64MB(32Mx16bitsx4banks)。此次使用是从笔记型电脑上拆下来的颗粒NT5DS32M16BS-6K
使用热风枪、烙铁相关工具将记忆体置换成64MB。
连接Debug Console
路由器在接近出货或开发时，会利用串列传轮的方式将路由器开机内容输出，拆开N305RE后就能看到已经焊好的连接线
连接线请使用3.3V相位输出的串列连接线，然后将GND相接、RX接连接线的TX，TX接连接线的RX后，在电脑上开启串列埠应用程式后将机器上电，之后就能看到输出的画面
CFE version 5.100.138.3 based on BBP 1.0.37 for BCM947XX (32bit,SP,LE)
Build Date: Mon May 2 16:06:18 KST 2011 (bcm5357@localhost.localdomain)
Copyright (C) 2000-2008 Broadcom Corporation.
Init Arena
Init Devs.
Boot partition size = 131072(0x20000)
Found an ST compatible serial flash with 64 64KB blocks; total size 4MB
et0: Broadcom BCM47XX 10/100/1000 Mbps Ethernet Controller 5.100.138.3
CPU type 0x19749: 300MHz
Tot mem: 32768 KBytes
Device eth0: hwaddr B8-55-10-E9-28-5A, ipaddr 192.168.0.1, mask 255.255.255.0
gateway not set, nameserver not set
进入CFE
先按下CTR+C之后将机器上电，CFE侦测到此按键会进入命令模式
CFE version 5.100.138.3 based on BBP 1.0.37 for BCM947XX (32bit,SP,LE)
Build Date: Mon May 2 16:06:18 KST 2011 (bcm5357@localhost.localdomain)
Copyright (C) 2000-2008 Broadcom Corporation.
Init Arena
Init Devs.
Boot partition size = 131072(0x20000)
Found an ST compatible serial flash with 64 64KB blocks; total size 4MB
et0: Broadcom BCM47XX 10/100/1000 Mbps Ethernet Controller 5.100.138.3
CPU type 0x19749: 300MHz
Tot mem: 32768 KBytes
Device eth0: hwaddr B8-55-10-E9-28-5A, ipaddr 192.168.0.1, mask 255.255.255.0
gateway not set, nameserver not set
Startup canceled
CFE> ^C
CFE> ^C
CFE>
查看NVRAM讯息
CFE> nvram show : : sdram_config=0x103 : : :
修改记忆体参数，注意！注意！注意！修改此参数如果不正确时，CFE会变砖
CFE> nvram set sdram_config=0x003 *** command status = 0 CFE>
修改后请务必查看参数是否正确变更
CFE> nvram show : : sdram_config=0x003 : : :
确定变更为0x003之后，执行储档动作，写入flash
CFE> nvram commit *** command status = 0 CFE>
重新开机，确认记忆体正确识别
CFE> reboot
Decompressing...done
CFE version 5.100.138.3 based on BBP 1.0.37 for BCM947XX (32bit,SP,LE)
Build Date: Mon May 2 16:06:18 KST 2011 (bcm5357@localhost.localdomain)
Copyright (C) 2000-2008 Broadcom Corporation.
Init Arena
Init Devs.
Boot partition size = 131072(0x20000)
Found an ST compatible serial flash with 64 64KB blocks; total size 4MB
et0: Broadcom BCM47XX 10/100/1000 Mbps Ethernet Controller 5.100.138.3
CPU type 0x19749: 300MHz
Tot mem: 65536 KBytes
Device eth0: hwaddr B8-55-10-E9-28-5A, ipaddr 192.168.0.1, mask 255.255.255.0
gateway not set, nameserver not set