自己编译的openwrt在开机时一直打印jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found...的错误提示
具体的输入信息是这样的。
uboot> http
Link down: eth0
Ethernet mode (duplex/speed): / Mbps
HTTP server is starting at IP: 192.168.0.250
HTTP server is ready! Request for: /
Request for: /style.css
Data will be downloaded at 0x80800000 in RAM
Upgrade type: firmware
Upload file size: bytes
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#################### HTTP upload is done! Upgrading... ****************************
* FIRMWARE UPGRADING *
* DO NOT POWER OFF DEVICE! *
**************************** Executing: erase 0x9F050000 +0x340004; cp.b 0x80800000 0x9F050000 0x340004 Erase flash from 0x9F050000 to 0x9F39FFFF in bank #
Erasing: #######################################
############## Erased sectors: Copying to flash...
Writting at address: 0x9F050000 Done! HTTP ugrade is done! Rebooting... Resetting the board... *********************************************
* U-Boot 1.1. (Jun ) *
********************************************* AP121 (AR9331) U-Boot for AP02 v0. DRAM: MB DDR2 -bit
FLASH: Gigadevice GD25Q64B ( MB)
CLOCKS: /// MHz (CPU/RAM/AHB/SPI) LED on during eth initialization... Hit any key to stop autobooting: Booting image at: 0x9F050000 Image name: MIPS OpenWrt Linux-3.10.
Created: -- :: UTC
Image type: MIPS Linux Kernel Image (lzma compressed)
Data size: Bytes = MB
Load address: 0x80060000
Entry point: 0x80060000 Uncompressing kernel image... OK!
Starting kernel... [ 0.000000] Linux version 3.10. (tf@ubuntu) (gcc version 4.8. (OpenWrt/Linaro GCC 4.8-2014.04 r42311) ) # Wed Sep :: CST
[ 0.000000] bootconsole [early0] enabled
[ 0.000000] CPU revision is: (MIPS 24Kc)
[ 0.000000] SoC: Atheros AR9330 rev
[ 0.000000] Clocks: CPU:.000MHz, DDR:.000MHz, AHB:.000MHz, Ref:.000MHz
[ 0.000000] Determined physical RAM map:
[ 0.000000] memory: @ (usable)
[ 0.000000] Initrd not found or empty - disabling initrd
[ 0.000000] Zone ranges:
[ 0.000000] Normal [mem 0x00000000-0x03ffffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node : [mem 0x00000000-0x03ffffff]
[ 0.000000] Primary instruction cache 64kB, VIPT, -way, linesize bytes.
[ 0.000000] Primary data cache 32kB, -way, VIPT, cache aliases, linesize bytes
[ 0.000000] Built zonelists in Zone order, mobility grouping on. Total pages:
[ 0.000000] Kernel command line: board=DRAGINO2 console=ttyATH0, mtdparts=spi0.:256k(u-boot)ro,64k(u-boot-env)ro,1280k(kernel),6464k(rootfs),64k(NVRAM),64k(ART)ro,7744k@0x50000(firmware) rootfstype=squashfs,jffs2 noinitrd
[ 0.000000] PID hash table entries: (order: -, bytes)
[ 0.000000] Dentry cache hash table entries: (order: , bytes)
[ 0.000000] Inode-cache hash table entries: (order: , bytes)
[ 0.000000] Writing ErrCtl register=
[ 0.000000] Readback ErrCtl register=
[ 0.000000] Memory: 61272k/65536k available (2239k kernel code, 4264k reserved, 604k data, 228k init, 0k highmem)
[ 0.000000] SLUB: HWalign=, Order=-, MinObjects=, CPUs=, Nodes=
[ 0.000000] NR_IRQS:
[ 0.000000] Calibrating delay loop... 265.42 BogoMIPS (lpj=)
[ 0.080000] pid_max: default: minimum:
[ 0.080000] Mount-cache hash table entries:
[ 0.090000] NET: Registered protocol family
[ 0.100000] MIPS: machine is Dragino Dragino v2
[ 0.510000] Register platform device spi_gpio.
[ 0.510000] Register board infos
[ 0.560000] bio: create slab <bio-> at
[ 0.560000] Switching to clocksource MIPS
[ 0.570000] NET: Registered protocol family
[ 0.570000] TCP established hash table entries: (order: , bytes)
[ 0.580000] TCP bind hash table entries: (order: -, bytes)
[ 0.580000] TCP: Hash tables configured (established bind )
[ 0.590000] TCP: reno registered
[ 0.590000] UDP hash table entries: (order: , bytes)
[ 0.600000] UDP-Lite hash table entries: (order: , bytes)
[ 0.610000] NET: Registered protocol family
[ 0.630000] squashfs: version 4.0 (//) Phillip Lougher
[ 0.630000] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) - Red Hat, Inc.
[ 0.650000] msgmni has been set to
[ 0.650000] io scheduler noop registered
[ 0.650000] io scheduler deadline registered (default)
[ 0.660000] Serial: / driver, ports, IRQ sharing disabled
[ 0.660000] ar933x-uart: ttyATH0 at MMIO 0x18020000 (irq = ) is a AR933X UART
[ 0.670000] console [ttyATH0] enabled, bootconsole disabled
[ 0.670000] console [ttyATH0] enabled, bootconsole disabled
[ 0.680000] ath79-spi ath79-spi: master is unqueued, this is deprecated
[ 0.690000] m25p80 spi0.: found gd25q64, expected m25p80
[ 0.690000] m25p80 spi0.: gd25q64 ( Kbytes)
[ 0.700000] cmdlinepart partitions found on MTD device spi0.
[ 0.710000] Creating MTD partitions on "spi0.0":
[ 0.710000] 0x000000000000-0x000000040000 : "u-boot"
[ 0.720000] 0x000000040000-0x000000050000 : "u-boot-env"
[ 0.720000] 0x000000050000-0x000000190000 : "kernel"
[ 0.730000] 0x000000190000-0x0000007e0000 : "rootfs"
[ 0.730000] mtd: device (rootfs) set to be root filesystem
[ 0.750000] mtdsplit: no squashfs found in "rootfs"
[ 0.770000] mtdsplit: no squashfs found in "spi0.0"
[ 0.770000] 0x0000007e0000-0x0000007f0000 : "NVRAM"
[ 0.780000] 0x0000007f0000-0x000000800000 : "ART"
[ 0.780000] 0x000000050000-0x0000007e0000 : "firmware"
[ 0.810000] libphy: ag71xx_mdio: probed
[ 1.360000] ag71xx-mdio.: Found an AR7240/AR9330 built-in switch
[ 2.390000] eth0: Atheros AG71xx at 0xba000000, irq , mode:GMII
[ 2.940000] ag71xx ag71xx.: connected to PHY at ag71xx-mdio.: [uid=004dd041, driver=Generic PHY]
[ 2.950000] eth1: Atheros AG71xx at 0xb9000000, irq , mode:MII
[ 2.960000] TCP: cubic registered
[ 2.960000] NET: Registered protocol family
[ 2.960000] 8021q: .1Q VLAN Support v1.
[ 2.970000] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000000: 0x1292 instead
[ 2.980000] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000004: 0x4e50 instead
[ 2.990000] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000008: 0xc936 instead
.....
造成这个问题的原因是因为我们对FLASH的分区不正确导致的，经过两天的跟踪我发现了这个问题出在image/Makefile中。
我这个板的MTDLAYOUT内容是这样子的：
dragino2_mtdlayout=mtdparts=spi0.0:256k(u-boot)ro,64k(u-boot-env)ro,1024k(kernel),6720k(rootfs),64k(NVRAM),64k(ART)ro,7744k@0x50000(firmware)
而我刚刚下载下去的Kernel大小为，即为1031kB，已经超出了1024k了。我猜想后面的rootfs已经不在0x150000（256k+64k+1024k）这个地址上了，真实的rootfs在哪儿我没有去测，但我猜测是在256k+64k+1056463=0x151ECF之后了。u-boot得到的消息却说rootfs在0x150000上，所以就出错了。
解决方法就是加大kernel的值，加这个值有讲究，只能64k地64k地加，如果kernel用不完这64k，就不要给它加128k，否则出错！所以这儿需要把MTDLAYOUT设置为
dragino2_mtdlayout=mtdparts=spi0.0:256k(u-boot)ro,64k(u-boot-env)ro,1088k(kernel),6656k(rootfs),64k(NVRAM),64k(ART)ro,7744k@0x50000(firmware)
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