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#contents

* tftpboot [#t2f74d17]
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To use u-boot-arm and USB-Ethernet adapter corresponding to OMAP3 EHCI, any OMAP 3 based device, which does not directly solder an Ethernet connector on its PCB such bc10, can apply tftpboot.~
~
To use tftpboot, the system can boot without rewriting an uImage on a SD card. This is useful when the addition of drivers and modifications of kernel are frequently done, and it makes the developing process more efficient than before it is used.~
~
To take advantage of the ease of renewing uImage, tftp server is generally configured at the machine which builds kernel.~
~
Since kernel of bc10-router is built with Toolchain of arago-project, this article assumes that Ubuntu 10.04 is its build environment.~

** USB-Ethernet adapter [#fb1dc310]
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The list of USB-Ethernet adapters, which work with tftpboot, is located at the directory of u-boot-arm/drivers/usb/eith/asx.c. Specifically, these USB-Ethernet adapters have to work with u-boot, which can handle tftpboot. The contents of the list suggest VernderID: ProductID.~
 static const struct asix_dongle const asix_dongles[] = {
         { 0x05ac, 0x1402, FLAG_TYPE_AX88772 },  /* Apple USB Ethernet Adapter */
         { 0x07d1, 0x3c05, FLAG_TYPE_AX88772 },  /* D-Link DUB-E100 H/W Ver B1 */
         /* Cables-to-Go USB Ethernet Adapter */
         { 0x0b95, 0x772a, FLAG_TYPE_AX88772 },
         { 0x0b95, 0x7720, FLAG_TYPE_AX88772 },  /* Trendnet TU2-ET100 V3.0R */
         { 0x0b95, 0x1720, FLAG_TYPE_AX88172 },  /* SMC */
         { 0x0db0, 0xa877, FLAG_TYPE_AX88772 },  /* MSI - ASIX 88772a */
         { 0x13b1, 0x0018, FLAG_TYPE_AX88172 },  /* Linksys 200M v2.1 */
         { 0x1557, 0x7720, FLAG_TYPE_AX88772 },  /* 0Q0 cable ethernet */
         /* DLink DUB-E100 H/W Ver B1 Alternate */
         { 0x2001, 0x3c05, FLAG_TYPE_AX88772 },
         /* ASIX 88772B */
         { 0x0b95, 0x772b, FLAG_TYPE_AX88772B | FLAG_EEPROM_MAC },
         { 0x0000, 0x0000, FLAG_NONE }   /* END - Do not remove */
 };
As of January 2013, Buffalo LUA-U2-ATX is widely available at Japanese market.~
To check its VenderID and Product ID, use lsusb, its output is shown below.~
 Bus 001 Device 004: ID 0b95:7720 ASIX Electronics Corp. AX88772

** Configuration of tftp server [#cfff6e80]
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Ubuntu 10.04 offers the several packages of tftp servers. This article uses atftpad.~
 $ sudo apt-get install atftpd
For the boot management, openbsd-inetd is installed together. However, once xinetd is installed, openbsd-inetd is removed, automatically.~
 $ sudo apt-get install xinetd
Edit tftp configuration file at xinetd.~
 $ sudo vim /etc/xinetd/tftpd
The contents of rftp configuration file are shown below.~
 service tftp
 {
     protocol        = udp
     port            = 69
     socket_type     = dgram
     wait            = yes
     user            = nobody
     group           = nobody
     server          = /usr/sbin/in.tftpd
     server_args     = --logfile /var/log/atftpd.log /var/lib/tftpboot
     only_from       = 192.168.0.0/24
     disable         = no
 }
only_from should change to the specific network address that you are currently using.~
server_args specifies the location, which stores kernel uImage.~
 $ cd /var/lib
 $ sudo mkdir tftpboot
The location and name of the log file, which records the status of connections to tftp, is specified as /ver/log/atfpd.log. Then, the log file is created.~
 $ sudo touch /var/log/atftpd.log
 $ sudo chown nobody:nobody /var/log/atftpd.log
Reboot xinetd.~
 $ sudo /etc/init.d/xinetd restart
The configuration of tftp server is completed.~
~
The name of kernel uImage, which tftp load, is uImage.beagle, and this image has to be stored at /var/lib/tftpboot. uImage is created by the way [[bc10-router/kernel update]] describes. Then, the image will be coped from kernel directory, which is shown below.
 $ sudo cp ~/linux-stable/arch/arm/boot/uImage /var/lib/tftpboot/uImage.beagle

** Configuration of bc10 tftpboot [#m1fd5996]
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Connect a USB-Ethernet adapter to the USB connector of bc10, directory or via a USB-Hub. Enable to input commands from the serial console, then boot bc10.~
~
Start up u-boot. Input the key while loading kernel, then bc10 will shift to command line interface.~
 U-Boot 2012.10-12320-g39826f0 (Oct 22 2012 - 17:03:16)
 
 OMAP3530-GP ES3.1, CPU-OPP2, L3-165MHz, Max CPU Clock 600 mHz
 OMAP3 Beagle board + LPDDR/NAND
 I2C:   ready
 DRAM:  256 MiB
 NAND:  512 MiB
 MMC:   OMAP SD/MMC: 0
 *** Warning - bad CRC, using default environment
 
 In:    serial
 Out:   serial
 Err:   serial
 Beagle Rev C1/C2/C3
 No EEPROM on expansion board
 Die ID #4ada00040000000004037b700d01401a
 Net:   Net Initialization Skipped
 No ethernet found.
 Hit any key to stop autoboot:  3
 OMAP3 beagleboard.org #
Let this USB-Ethernet adapter be recognized, configure the network for tftp, and load uImage.~
ipaddr indicates IP address that is set up at bc10.~
serverip is IP address that tftp server.~
 OMAP3 beagleboard.org # usb start
 (Re)start USB...
 USB0:   USB EHCI 1.00
 scanning bus 0 for devices... 4 USB Device(s) found
        scanning usb for storage devices... 0 Storage Device(s) found
        scanning usb for ethernet devices...
 Warning: asx0 using MAC address from net device
 1 Ethernet Device(s) found
 OMAP3 beagleboard.org # setenv ipaddr 192.168.0.128
 OMAP3 beagleboard.org # setenv netmask 255.255.255.0
 OMAP3 beagleboard.org # setenv serverip 192.168.0.203
 OMAP3 beagleboard.org # tftpboot
After tftpboot is executed, if uImage.geagle is read correctly, the log shown below displayed.~
 Waiting for Ethernet connection... done.
 Using asx0 device
 TFTP from server 192.168.0.203; our IP address is 192.168.0.128
 Filename 'uImage.beagle'.
 Load address: 0x80200000
 Loading: T #################################################################
 #################################################################
 #################################################################
 ###################
 done
 Bytes transferred = 3137352 (2fdf48 hex)
When uImage is read into memory correctly, bootargs is configured.~
 OMAP3 beagleboard.org # setenv bootargs console=ttyO2,115200n8 mpurate=auto buddy=none camera=none vram=12M omapfb.mode=dvi:640x480MR-16@60 omapdss.def disp=dvi root=/dev/mmcblk0p2 rw rootfstype=ext3 rootwait
~
To execute bootm command, if it works correctly, the configuration is OK.~
 OMAP3 beagleboard.org # bootm
 ## Booting kernel from Legacy Image at 80200000 ...
    Image Name:   Arago/3.7.2/beagleboard
    Image Type:   ARM Linux Kernel Image (uncompressed)
    Data Size:    3425904 Bytes = 3.3 MiB
    Load Address: 80008000
    Entry Point:  80008000
    Verifying Checksum ... OK
    Loading Kernel Image ... OK
 OK
 
 Starting kernel ...
 
 Uncompressing Linux... done, booting the kernel.
 [    0.000000] Booting Linux on physical CPU 0
 [    0.000000] Initializing cgroup subsys cpuset
 [    0.000000] Initializing cgroup subsys cpu
 [    0.000000] Linux version 3.7.2 (otsuka@bc10-dev) (gcc version 4.5.3 20110311 (prerelease) (GCC) ) #1 Fri Jan 25 22:45:08 JST 2012
 [    0.000000] CPU: ARMv7 Processor [411fc083] revision 3 (ARMv7), cr=10c53c7d
 [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT nonaliasing instruction cache
 [    0.000000] Machine: OMAP3 Beagle Board
 Skipping...
If there are items that you like to set at startup u-boot, please modify the configuration appropriately, such as adding no_suspend_console to bootargs.~

* Revision History [#qde1d307]
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- 2013-08-09 This article is initially uploaded.