内核移植后内存显示不正确
在下移植linux2.6.36到2440上时，移植成功了，但是发现内存的显示不正解，我用的是vivi，没有用uboot
本来应该是64M的，怎么会少呢？
启动信息如下：
Linux version 2.6.36.4 (root@FC) (gcc version 4.3.2 (Sourcery G++ Lite 2008q3-72) ) #19 Fri Oct 28 22:50:14 CST 2011
CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=c0007177
CPU: VIVT data cache, VIVT instruction cache
Machine: SMDK2440
Memory policy: ECC disabled, Data cache writeback
CPU S3C2440A (id 0x32440001)
S3C24XX Clocks, Copyright 2004 Simtec Electronics
S3C244X: core 405.000 MHz, memory 101.250 MHz, peripheral 50.625 MHz
CLOCK: Slow mode (1.500 MHz), fast, MPLL on, UPLL on
Built 1 zonelists in Zone order, mobility grouping off. Total pages: 4064
Kernel command line: root=/dev/nfs nfsroot=192.168.1.118:/opt/kernel/rootfs ip=192.168.1.100:192.168.1.170:192.168.1.1:255.255.255.0:LAB701.170:eth0:off init=/linuxrc console=ttySAC0,115200
PID hash table entries: 64 (order: -4, 256 bytes)
Dentry cache hash table entries: 2048 (order: 1, 8192 bytes)
Inode-cache hash table entries: 1024 (order: 0, 4096 bytes)
Memory: 16MB = 16MB total
Memory: 11784k/11784k available, 4600k reserved, 0K highmem
Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
DMA : 0xffc00000 - 0xffe00000 ( 2 MB)
vmalloc : 0xc1800000 - 0xe0000000 ( 488 MB)
lowmem : 0xc0000000 - 0xc1000000 ( 16 MB)
modules : 0xbf000000 - 0xc0000000 ( 16 MB)
.init : 0xc0008000 - 0xc002c000 ( 144 kB)
.text : 0xc002c000 - 0xc03e2000 (3800 kB)
.data : 0xc0402000 - 0xc0426440 ( 146 kB)
Hierarchical RCU implementation.
RCU-based detection of stalled CPUs is disabled.
Verbose stalled-CPUs detection is disabled.
NR_IRQS:99
irq: clearing pending ext status 00000200
irq: clearing subpending status 00000003
irq: clearing subpending status 00000002
Console: colour dummy device 80x30
console [ttySAC0] enabled
Calibrating delay loop... 201.93 BogoMIPS (lpj=504832)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
gpiochip_add: gpios 288..303 (GPIOK) failed to register
gpiochip_add: gpios 320..334 (GPIOL) failed to register
gpiochip_add: gpios 352..353 (GPIOM) failed to register
NET: Registered protocol family 16
S3C Power Management, Copyright 2004 Simtec Electronics
S3C2440: Initialising architecture
S3C2440: IRQ Support
S3C24XX DMA Driver, Copyright 2003-2006 Simtec Electronics
DMA channel 0 at c1808000, irq 33
DMA channel 1 at c1808040, irq 34
DMA channel 2 at c1808080, irq 35
DMA channel 3 at c18080c0, irq 36
S3C244X: Clock Support, DVS off
bio: create slab <bio-0> at 0
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
Advanced Linux Sound Architecture Driver Version 1.0.23.
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 512 (order: 0, 4096 bytes)
TCP bind hash table entries: 512 (order: -1, 2048 bytes)
TCP: Hash tables configured (established 512 bind 512)
TCP reno registered
UDP hash table entries: 256 (order: 0, 4096 bytes)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
NET: Registered protocol family 1
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
NetWinder Floating Point Emulator V0.97 (extended precision)
JFFS2 version 2.2. (NAND) (SUMMARY) © 2001-2006 Red Hat, Inc.
ROMFS MTD (C) 2007 Red Hat, Inc.
msgmni has been set to 23
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
Console: switching to colour frame buffer device 30x40
fb0: s3c2410fb frame buffer device
lp: driver loaded but no devices found
ppdev: user-space parallel port driver
Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
s3c2440-uart.0: s3c2410_serial0 at MMIO 0x50000000 (irq = 70) is a S3C2440
s3c2440-uart.1: s3c2410_serial1 at MMIO 0x50004000 (irq = 73) is a S3C2440
s3c2440-uart.2: s3c2410_serial2 at MMIO 0x50008000 (irq = 76) is a S3C2440
brd: module loaded
loop: module loaded
Uniform Multi-Platform E-IDE driver
ide-gd driver 1.18
ide-cd driver 5.00
S3C24XX NAND Driver, (c) 2004 Simtec Electronics
s3c24xx-nand s3c2440-nand: Tacls=3, 29ns Twrph0=7 69ns, Twrph1=3 29ns
s3c24xx-nand s3c2440-nand: NAND soft ECC
NAND device: Manufacturer ID: 0xec, Chip ID: 0x76 (Samsung NAND 64MiB 3,3V 8-bit)
Scanning device for bad blocks
Creating 3 MTD partitions on "NAND":
0x000000000000-0x000000030000 : "Boot Agent"
0x000000050000-0x000000250000 : "Kernel"
0x000000250000-0x000003ffc000 : "Root"
allocate cs8900 device ok./nCirrus Logic CS8900A driver for Linux (Modified for ZL2440)/ndebug:[cs8900_probe-514]/ndebug:[cs8900_probe-523]/ndebug:[cs8900_probe-529]/n
eth0: CS8900A rev E at 0xe0000300 irq=53, addr: 00: 0:3E:26:0A: 0/n
console [netcon0] enabled
netconsole: network logging started
usbmon: debugfs is not available
ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
s3c2410-ohci s3c2410-ohci: S3C24XX OHCI
s3c2410-ohci s3c2410-ohci: new USB bus registered, assigned bus number 1
s3c2410-ohci s3c2410-ohci: irq 42, io mem 0x49000000
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
usbcore: registered new interface driver libusual
usbcore: registered new interface driver usbserial
USB Serial support registered for generic
usbcore: registered new interface driver usbserial_generic
usbserial: USB Serial Driver core
USB Serial support registered for FTDI USB Serial Device
usbcore: registered new interface driver ftdi_sio
ftdi_sio: v1.6.0:USB FTDI Serial Converters Driver
USB Serial support registered for pl2303
usbcore: registered new interface driver pl2303
pl2303: Prolific PL2303 USB to serial adaptor driver
mice: PS/2 mouse device common for all mice
S3C24XX RTC, (c) 2004,2006 Simtec Electronics
S3C2410 Watchdog Timer, (c) 2004 Simtec Electronics
s3c2410-wdt s3c2410-wdt: watchdog inactive, reset disabled, irq enabled
ALSA device list:
No soundcards found.
TCP cubic registered
NET: Registered protocol family 17
drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
IP-Config: Complete:
device=eth0, addr=192.168.1.100, mask=255.255.255.0, gw=192.168.1.1,
host=LAB701, domain=, nis-domain=170,
bootserver=192.168.1.170, rootserver=192.168.1.118, rootpath=
Looking up port of RPC 100003/2 on 192.168.1.118
Looking up port of RPC 100005/1 on 192.168.1.118
VFS: Mounted root (nfs filesystem) readonly on device 0:12.
Freeing init memory: 144K
hwclock: can't open '/dev/misc/rtc': No such file or directory
ln: /dev/tty0: Read-only file system
ln: /dev/dsp: Read-only file system
ln: /dev/mixer: Read-only file system
mdev: mknod ram0: Read-only file system
hello
ln: /dev/tty2: Read-only file system
ln: /dev/tty3: Read-only file system
ln: /dev/tty4: Read-only file system
hostname: can't open 'Mars': No such file or directory
Please press Enter to activate this console.
[解决办法]
在命令行中加入mem=64M试试呢
------解决方案--------------------
在系统中看一下，UBOOT中是要设置内存的，显示有时不准确。