接着前一篇博文。
在上一篇博文中我们用NFS挂载根文件系统的方式启动了系统，接下来我们把移植了Python3的根文件系统固化到NandFlash中，但是由于linux-4.9目前不支持Yaffs2文件系统，所以我们用Jiffs2文件系统。
下面我们分为几部分：
1、移植mtd-utils工具
2、固化根文件系统到NandFlash中
3、支持Telnet
 

平台

硬件：TQ2440  64MB内存 256MB NandFlash
bootloader：U-Boot 2015.04
kernel：linux-4.9
Python: Python-3.6.0
工具链：arm-none-linux-gnueabi-gcc  4.8.3
 

正文

一、移植mtd-utils工具

mtd-utils提供了大量的用于操作Flash的工具，这里需要首先下载编译一些依赖包。
下面是编译脚本：
 #!/bin/bash

 export CC=arm-linux-gcc

 ../configure --prefix=`pwd` \

         --shared

然后编译make && make install

  • lzo-2.10
编译脚本：
 #!/bin/bash

 ../configure --host=arm-linux \

         CC="arm-linux-gcc" \

         --prefix=`pwd`

然后编译make && make install

  • e2fsprogs-1.43.4
编译：
 #!/bin/bash

 ../configure --host=arm-linux \

         CC="arm-linux-gcc" \

         --prefix=`pwd`

编译 make && make install

  • mtd-utils
编译：
 ( pengdl@ubuntu | ~/Study/tq2440/MTD_UTILS/mtd-utils-v2 | Remote:True )

 $./autogen.sh

 ( pengdl@ubuntu | ~/Study/tq2440/MTD_UTILS/mtd-utils-v2 | Remote:True Ret:  @ :: )

 $cd build_tq2440/

 ( pengdl@ubuntu | ~/Study/tq2440/MTD_UTILS/mtd-utils-v2/build_tq2440 | Remote:True )

 $./mk.sh

编译脚本：

 #!/bin/bash

 export CC=arm-linux-gcc

 export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/home/pengdl/Study/tq2440/MTD_UTILS/e2fsprogs-1.43./build_tq2440/lib/uuid

 ../configure --host=arm-linux \

         --prefix=`pwd` \

         LDFLAGS="-L/home/pengdl/Study/tq2440/MTD_UTILS/zlib-1.2.11/build_tq2440/lib \

         -L/home/pengdl/Study/tq2440/MTD_UTILS/lzo-2.10/build_tq2440/lib \

         -L/home/pengdl/Study/tq2440/MTD_UTILS/e2fsprogs-1.43./build_tq2440/lib" \

         CPPFLAGS="-I/home/pengdl/Study/tq2440/MTD_UTILS/zlib-1.2.11/build_tq2440/include \

         -I/home/pengdl/Study/tq2440/MTD_UTILS/lzo-2.10/build_tq2440/include \

         -I/home/pengdl/Study/tq2440/MTD_UTILS/e2fsprogs-1.43./build_tq2440/include"

 make -j4

 make install

在sbin下面会生成我们需要的工具， 这里我们只要flash_eraseall和flash_erase两个工具， 将这两个工具拷贝到根文件系统的/bin下面。

二、固化根文件系统到NandFlash

先把前一篇博文中生成的rootfs目录进行压缩：
sudo tar -czf rootfs.tar.gz rootfs

然后将rootfs.tar.gz拷贝到根文件系统下面，然后启动系统，烧写系统：

 flash_eraseall  /dev/mtd5

 mount -t jffs2 /dev/mtdblock5 /mnt

 tar -xf rootfs.tar.gz /mnt

 cd /mnt

 mv rootfs/* .

 rm -r rootfs

然后修改uboot的bootargs参数：

noinitrd root=/dev/mtdblock5 rw rootfstype=jffs2 console=ttySAC0,115200n init=/linuxrc

三、支持telnet

四、开机log

 U-Boot 2015.04-g5095150 (Dec   - ::)

 CPUID:

 FCLK:       MHz

 HCLK:       MHz

 PCLK:        MHz

 I2C:   ready

 DRAM:   MiB

 WARNING: Caches not enabled

 Flash:  Bytes

 NAND:   MiB

 In:    serial

 Out:   serial

 Err:   serial

 Net:   dm9000

 Hit any key to stop autoboot:   

 NAND read: device  offset 0x300000, size 0x500000

   bytes read: OK

 NAND read: device  offset 0x800000, size 0x100000

   bytes read: OK

 ## Booting kernel from Legacy Image at  ...

    Image Name:   Linux-4.9.+

    Created:      --  :: UTC

    Image Type:   ARM Linux Kernel Image (uncompressed)

    Data Size:     Bytes = 3.3 MiB

    Load Address:

    Entry Point:

    Verifying Checksum ... OK

 ## Flattened Device Tree blob at

    Booting using the fdt blob at 0x32000000

    Loading Kernel Image ... OK

    Loading Device Tree to 33aa6000, end 33aaa62c ... OK

 Starting kernel ...

 Uncompressing Linux... done, booting the kernel.

 [    0.000000] Booting Linux on physical CPU 0x0

 [    0.000000] Linux version 4.9.+ (pengdl@ubuntu) (gcc version 4.8.  (prerelease) (Sourcery CodeBench Lite 2014.05-) ) # Wed Apr  :: PDT

 [    0.000000] CPU: ARM920T [] revision  (ARMv4T), cr=c000717f

 [    0.000000] CPU: VIVT data cache, VIVT instruction cache

 [    0.000000] OF: fdt:Machine model: TQ2440

 [    0.000000] Memory policy: Data cache writeback

 [    0.000000] DT missing boot CPU MPIDR[:], fall back to default cpu_logical_map

 [    0.000000] Built  zonelists in Zone order, mobility grouping on.  Total pages:

 [    0.000000] Kernel command line: noinitrd root=/dev/mtdblock5 rw rootfstype=jffs2  console=ttySAC0,115200n init=/linuxrc

 [    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] Memory: 57900K/65536K available (4729K kernel code, 234K rwdata, 1376K rodata, 204K init, 262K bss, 7636K reserved, 0K cma-reserved)

 [    0.000000] Virtual kernel memory layout:

 [    0.000000]     vector  : 0xffff0000 - 0xffff1000   (    kB)

 [    0.000000]     fixmap  : 0xffc00000 - 0xfff00000   ( kB)

 [    0.000000]     vmalloc : 0xc4800000 - 0xff800000   (  MB)

 [    0.000000]     lowmem  : 0xc0000000 - 0xc4000000   (   MB)

 [    0.000000]     modules : 0xbf000000 - 0xc0000000   (   MB)

 [    0.000000]       .text : 0xc0008000 - 0xc04a67f0   ( kB)

 [    0.000000]       .init : 0xc0627000 - 0xc065a000   (  kB)

 [    0.000000]       .data : 0xc065a000 - 0xc0694840   (  kB)

 [    0.000000]        .bss : 0xc0694840 - 0xc06d60a8   (  kB)

 [    0.000000] SLUB: HWalign=, Order=-, MinObjects=, CPUs=, Nodes=

 [    0.000000] NR_IRQS:

 [    0.000000] irq: clearing pending status

 [    0.000000] _get_rate: could not find clock xti

 [    0.000128] sched_clock:  bits at 1000kHz, resolution 1000ns, wraps every 32767500ns

 [    0.000262] clocksource: samsung_clocksource_timer: mask: 0xffff max_cycles: 0xffff, max_idle_ns:  ns

 [    0.001283] Console: colour dummy device 80x30

 [    0.001485] Calibrating delay loop... 199.47 BogoMIPS (lpj=)

 [    0.035125] pid_max: default:  minimum:

 [    0.035715] Mount-cache hash table entries:  (order: ,  bytes)

 [    0.035803] Mountpoint-cache hash table entries:  (order: ,  bytes)

 [    0.039125] CPU: Testing write buffer coherency: ok

 [    0.041713] Setting up static identity map for 0x30008200 - 0x30008258

 [    0.067192] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns:  ns

 [    0.067812] pinctrl core: initialized pinctrl subsystem

 [    0.071047] NET: Registered protocol family

 [    0.074165] DMA: preallocated  KiB pool for atomic coherent allocations

 [    0.096405] cpuidle: using governor ladder

 [    0.097029] No ATAGs?

 [    0.355694] SCSI subsystem initialized

 [    0.357161] usbcore: registered new interface driver usbfs

 [    0.357830] usbcore: registered new interface driver hub

 [    0.358518] usbcore: registered new device driver usb

 [    0.362268] Advanced Linux Sound Architecture Driver Initialized.

 [    0.393373] clocksource: Switched to clocksource samsung_clocksource_timer

 [    0.460629] NET: Registered protocol family

 [    0.464553] TCP established hash table entries:  (order: ,  bytes)

 [    0.464669] TCP bind hash table entries:  (order: ,  bytes)

 [    0.464723] TCP: Hash tables configured (established  bind )

 [    0.465667] UDP hash table entries:  (order: ,  bytes)

 [    0.465778] UDP-Lite hash table entries:  (order: ,  bytes)

 [    0.466911] NET: Registered protocol family

 [    0.545633] RPC: Registered named UNIX socket transport module.

 [    0.545741] RPC: Registered udp transport module.

 [    0.545757] RPC: Registered tcp transport module.

 [    0.545773] RPC: Registered tcp NFSv4. backchannel transport module.

 [    0.553953] futex hash table entries:  (order: -,  bytes)

 [    0.562980] workingset: timestamp_bits= max_order= bucket_order=

 [    0.697643] NFS: Registering the id_resolver key type

 [    0.697875] Key type id_resolver registered

 [    0.697912] Key type id_legacy registered

 [    0.697998] nfs4filelayout_init: NFSv4 File Layout Driver Registering...

 [    0.698281] jffs2: version 2.2. (NAND) © - Red Hat, Inc.

 [    0.707965] romfs: ROMFS MTD (C)  Red Hat, Inc.

 [    0.728928] io scheduler noop registered

 [    0.729037] io scheduler deadline registered

 [    0.731029] io scheduler cfq registered (default)

 [    0.945571] .serial: ttySAC0 at MMIO 0x50000000 (irq = , base_baud = ) is a S3C2440

 [    1.303277] random: fast init done

 [    1.537741] console [ttySAC0] enabled

 [    1.693858] brd: module loaded

 [    1.698712] s3c24xx-nand 4e000000.nand: Tacls=, 10ns Twrph0= 30ns, Twrph1= 10ns

 [    1.701109] s3c24xx-nand 4e000000.nand: NAND ECC disabled

 [    1.706441] nand: device found, Manufacturer ID: 0xec, Chip ID: 0xda

 [    1.712658] nand: Samsung NAND 256MiB ,3V -bit

 [    1.717150] nand:  MiB, SLC, erase size:  KiB, page size: , OOB size:

 [    1.724707] nand: NAND_ECC_NONE selected by board driver. This is not recommended!

 [    1.732301] Scanning device for bad blocks

 [    1.761552] Bad eraseblock  at 0x000002d80000

 [    1.761944] Bad eraseblock  at 0x000002e20000

 [    1.774618] Bad eraseblock  at 0x0000045c0000

 [    1.810576] Bad eraseblock  at 0x00000a160000

 [    1.835265] Bad eraseblock  at 0x00000e000000

 [    1.835424] Bad eraseblock  at 0x00000e020000

 [    1.851744] Creating  MTD partitions on "tq2440-0":

 [    1.851909] 0x000000000000-0x000000100000 : "SPL"

 [    1.860632] ftl_cs: FTL header not found.

 [    1.867840] 0x000000100000-0x000000200000 : "U-BOOT"

 [    1.876060] ftl_cs: FTL header not found.

 [    1.881673] 0x000000200000-0x000000300000 : "PARAMS"

 [    1.887146] ftl_cs: FTL header not found.

 [    1.895758] 0x000000300000-0x000000800000 : "KERNEL"

 [    1.904875] ftl_cs: FTL header not found.

 [    1.910723] 0x000000800000-0x000000900000 : "DTB"

 [    1.916009] ftl_cs: FTL header not found.

 [    1.925445] 0x000000900000-0x000010000000 : "ROOTFS"

 [    1.937184] ftl_cs: FTL header not found.

 [    1.949791] eth0: dm9000e at c4932000,c4934004 IRQ  MAC: ::de:ad:be:ef (platform data)

 [    1.953206] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver

 [    1.959146] ohci-s3c2410: OHCI S3C2410 driver

 [    1.966554] s3c2410-ohci .usb_ohci: OHCI Host Controller

 [    1.969213] s3c2410-ohci .usb_ohci: new USB bus registered, assigned bus number

 [    1.978389] s3c2410-ohci .usb_ohci: irq , io mem 0x49000000

 [    2.049314] hub -:1.0: USB hub found

 [    2.051489] hub -:1.0:  ports detected

 [    2.057806] usbcore: registered new interface driver usb-storage

 [    2.060801] mousedev: PS/ mouse device common for all mice

 [    2.066162] s3c-rtc .rtc: rtc disabled, re-enabling

 [    2.070382] rtc rtc0: alarm rollover not handled

 [    2.073906] rtc rtc0: invalid alarm value: -- ::

 [    2.080535] s3c-rtc .rtc: rtc core: registered s3c as rtc0

 [    2.086568] i2c /dev entries driver

 [    2.093037] s3c2410-wdt .watchdog: watchdog inactive, reset disabled, irq disabled

 [    2.099750] sdhci: Secure Digital Host Controller Interface driver

 [    2.103179] sdhci: Copyright(c) Pierre Ossman

 [    2.110337] hidraw: raw HID events driver (C) Jiri Kosina

 [    2.122224] usbcore: registered new interface driver usbhid

 [    2.122350] usbhid: USB HID core driver

 [    2.131286] NET: Registered protocol family

 [    2.132068] Key type dns_resolver registered

 [    2.197106] s3c-rtc .rtc: setting system clock to -- :: UTC ()

 [    2.201017] ALSA device list:

 [    2.203000]   No soundcards found.

 [    8.385039] VFS: Mounted root (jffs2 filesystem) on device :.

 [    8.386953] Freeing unused kernel memory: 204K (c0627000 - c065a000)

 [    8.392017] This architecture does not have kernel memory protection.

 [   11.614549] dm9000 .ethernet eth0: link up, 100Mbps, full-duplex, lpa 0xCDE1

 Please press Enter to activate this console.

 [root@tq2440 ]#

 [root@tq2440 ]# mount

 /dev/root on / type jffs2 (rw,relatime)

 proc on /proc type proc (rw,relatime)

 tmpfs on /tmp type tmpfs (rw,relatime)

 sysfs on /sys type sysfs (rw,relatime)

 tmpfs on /dev type tmpfs (rw,relatime)

 debugfs on /sys/kernel/debug type debugfs (rw,relatime)

 devpts on /dev/pts type devpts (rw,relatime,mode=,ptmxmode=)

 [root@tq2440 ]# cat /proc/mtd

 dev:    size   erasesize  name

 mtd0:   "SPL"

 mtd1:   "U-BOOT"

 mtd2:   "PARAMS"

 mtd3:   "KERNEL"

 mtd4:   "DTB"

 mtd5: 0f700000  "ROOTFS"

 [root@tq2440 ]#
完。

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