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): 1/1000 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: 3407876 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 #1
Erasing: #######################################
         ##############

Erased sectors: 53

Copying to flash...
Writting at address: 0x9F050000

Done!

HTTP ugrade is done! Rebooting...

Resetting the board...

*********************************************
*        U-Boot 1.1.4  (Jun 12 2014)        *
*********************************************

AP121 (AR9331) U-Boot for AP02 v0.0

DRAM:   64 MB DDR2 16-bit
FLASH:  Gigadevice GD25Q64B (8 MB)
CLOCKS: 400/400/200/33 MHz (CPU/RAM/AHB/SPI)

LED on during eth initialization...

Hit any key to stop autobooting:  0 

Booting image at: 0x9F050000

   Image name:   MIPS OpenWrt Linux-3.10.49
   Created:      2014-09-03   7:30:58 UTC
   Image type:   MIPS Linux Kernel Image (lzma compressed)
   Data size:    1056463 Bytes = 1 MB
   Load address: 0x80060000
   Entry point:  0x80060000

Uncompressing kernel image... OK!
Starting kernel...

[    0.000000] Linux version 3.10.49 ([email protected]) (gcc version 4.8.3 (OpenWrt/Linaro GCC 4.8-2014.04 r42311) ) #25 Wed Sep 3 15:30:48 CST 2014
[    0.000000] bootconsole [early0] enabled
[    0.000000] CPU revision is: 00019374 (MIPS 24Kc)
[    0.000000] SoC: Atheros AR9330 rev 1
[    0.000000] Clocks: CPU:400.000MHz, DDR:400.000MHz, AHB:200.000MHz, Ref:25.000MHz
[    0.000000] Determined physical RAM map:
[    0.000000]  memory: 04000000 @ 00000000 (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   0: [mem 0x00000000-0x03ffffff]
[    0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes.
[    0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases, linesize 32 bytes
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 16256
[    0.000000] Kernel command line:  board=DRAGINO2 console=ttyATH0,115200 mtdparts=spi0.0:256k(u-boot)ro,64k(u-boot-env)ro,1280k(kernel),6464k(rootfs),64k(NVRAM),64k(ART)ro,[email protected]0x50000(firmware) rootfstype=squashfs,jffs2 noinitrd
[    0.000000] PID hash table entries: 256 (order: -2, 1024 bytes)
[    0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
[    0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
[    0.000000] Writing ErrCtl register=00000000
[    0.000000] Readback ErrCtl register=00000000
[    0.000000] Memory: 61272k/65536k available (2239k kernel code, 4264k reserved, 604k data, 228k init, 0k highmem)
[    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] NR_IRQS:51
[    0.000000] Calibrating delay loop... 265.42 BogoMIPS (lpj=1327104)
[    0.080000] pid_max: default: 32768 minimum: 301
[    0.080000] Mount-cache hash table entries: 512
[    0.090000] NET: Registered protocol family 16
[    0.100000] MIPS: machine is Dragino Dragino v2
[    0.510000] Register platform device spi_gpio.1
[    0.510000] Register board infos
[    0.560000] bio: create slab <bio-0> at 0
[    0.560000] Switching to clocksource MIPS
[    0.570000] NET: Registered protocol family 2
[    0.570000] TCP established hash table entries: 512 (order: 0, 4096 bytes)
[    0.580000] TCP bind hash table entries: 512 (order: -1, 2048 bytes)
[    0.580000] TCP: Hash tables configured (established 512 bind 512)
[    0.590000] TCP: reno registered
[    0.590000] UDP hash table entries: 256 (order: 0, 4096 bytes)
[    0.600000] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[    0.610000] NET: Registered protocol family 1
[    0.630000] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.630000] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[    0.650000] msgmni has been set to 119
[    0.650000] io scheduler noop registered
[    0.650000] io scheduler deadline registered (default)
[    0.660000] Serial: 8250/16550 driver, 1 ports, IRQ sharing disabled
[    0.660000] ar933x-uart: ttyATH0 at MMIO 0x18020000 (irq = 11) 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 spi0.0: found gd25q64, expected m25p80
[    0.690000] m25p80 spi0.0: gd25q64 (8192 Kbytes)
[    0.700000] 7 cmdlinepart partitions found on MTD device spi0.0
[    0.710000] Creating 7 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 3 (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.1: Found an AR7240/AR9330 built-in switch
[    2.390000] eth0: Atheros AG71xx at 0xba000000, irq 5, mode:GMII
[    2.940000] ag71xx ag71xx.0: connected to PHY at ag71xx-mdio.1:04 [uid=004dd041, driver=Generic PHY]
[    2.950000] eth1: Atheros AG71xx at 0xb9000000, irq 4, mode:MII
[    2.960000] TCP: cubic registered
[    2.960000] NET: Registered protocol family 17
[    2.960000] 8021q: 802.1Q VLAN Support v1.8
[    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,[email protected](firmware)

而我刚刚下载下去的Kernel大小为1056463，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,[email protected](firmware)

时间： 2024-08-23 13:33:33

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