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Thread: Linux on 7" mini netbook ARM-VT8500 ?

  1. #1021
    Join Date
    Apr 2010
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    30

    Re: Linux on 7" mini netbook ARM-VT8500 ?

    Quote Originally Posted by PrFaas View Post
    I'm slowly getting the notion that -in the driver and/or hardware- these two switches might have gotten 'swapped'.
    My easypc had the SD write bug - but detected cards fine.
    I think one of the motherboard revisions connects the SD shield (switch case) to the wrong potential, so the sense line ends up always high. I fixed it on mine by removing the feed resistor and grounding the case/common.
    I didn't think to try flipping the switch to WP - which would leave the line floating, IIRC... hopefully there is a pull-up/down on it somewhere else! Having reversed the logic level in software vs. hardware seems most likely...
    WM8505 and VT8500 netbooks - wiki at http://bento-linux.org

  2. #1022
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    Re: Linux on 7" mini netbook ARM-VT8500 ?

    So I found something Kind of interesting out tonight, I have two VT8500 (neither are wm's or 05's) and even though they are the same, they are both different, there is one micro chip that on one is on the little removeable (Ram type) card, and on the other its sottered to teh board, and its obvious that it can be put in either spot on either, ill post pictures to show you what chip and where I'm talking about

    I hope its obvious which chip I'm talking about
    Attached Images Attached Images

  3. #1023
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    Re: Linux on 7" mini netbook ARM-VT8500 ?

    So I asked a while ago and no one answered as to how I could go about hooking up to the serial on my laptop, i was jsut browsing the web and found this
    http://wm8505.blogspot.com/
    is that how I would go about it? with a usb? and I thought I had heard someone say something earlier about not using 5V, using 3?

    Please asnwer I want to know, I uave a friend thats really good at sottering that I only get to see about once very 2-3 months and If that is right id like to get him to do it now, instead of having to wait till like december.

    Thanks

  4. #1024
    Join Date
    Nov 2009
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    Re: Linux on 7" mini netbook ARM-VT8500 ?

    Quote Originally Posted by DonutFUN View Post
    So I asked a while ago and no one answered as to how I could go about hooking up to the serial on my laptop, i was jsut browsing the web and found this
    http://wm8505.blogspot.com/
    is that how I would go about it? with a usb? and I thought I had heard someone say something earlier about not using 5V, using 3?

    Please asnwer I want to know, I uave a friend thats really good at sottering that I only get to see about once very 2-3 months and If that is right id like to get him to do it now, instead of having to wait till like december.

    Thanks
    I have a vt-8500 but have yet to hook up a serial. That Link you provided looks about right. You should be able to confirm the power requirements by searching through the forum.

  5. #1025
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    Jan 2010
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    Amsterdam, Netherlands
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    93

    Re: Linux on 7" mini netbook ARM-VT8500 ?

    Quote Originally Posted by DonutFUN View Post
    So I asked a while ago and no one answered as to how I could go about hooking up to the serial on my laptop, i was jsut browsing the web and found this
    http://wm8505.blogspot.com/
    is that how I would go about it? with a usb? and I thought I had heard someone say something earlier about not using 5V, using 3?

    Please asnwer I want to know, I uave a friend thats really good at sottering that I only get to see about once very 2-3 months and If that is right id like to get him to do it now, instead of having to wait till like december.

    Thanks
    'my' activities start around post #128 ('page 13'), and 'about post #175 and 'onwards' i describe the serial port i connected to my machine. The ASCII drawing in post #177 is primitive, but that *is* what i've now got connected to my machine. Post #155 mentions the fact that the four 'pads' marked gnd, tx, rx and 5V are the ground, txd, rxd and (no mistake..) 3.3 Volts supply pads that can be used to hook up a serial port. The default baudrate is 115200 BAUD, 8 bits, no parity. The pad on the board is marked 5V, but actually supplies only 3.3 Volts, and the serial interface must accept/generate no more that 3.3 Volts at the tx(d) and rx(d) pads. Post #202 (page 21) has the complete circuit diagram as 'ascii art'. In post #217 (page 22) mr. #217 Matriark TerVel has made a picture version of the circuit. In post #223 the situation with the Vcc (5.0 Volts) for genrating the supply voltage for an 'internal' RS232 buffer is again discussed. At post #248, i have my serial console (finally) completely working.

    Hope that provides enough guidance in the forest of posts.... Good luck, and please *never* put 5.0 Volts on the rx pin: that would destroy your CPU (see post #234)

  6. #1026
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    Re: Linux on 7" mini netbook ARM-VT8500 ?

    OK, never mind what I was asking then, I thought it was simple wire to wire connection, I didn't know there needed to be resisters and all that jazz, so never mind then

  7. #1027
    Join Date
    Sep 2010
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    Re: Linux on 7" mini netbook ARM-VT8500 ?

    Quote Originally Posted by alchark View Post
    ibsrom, could you post a link to where your device is sold? I have not seen such configurations yet, could be interesting (with proper software, of course)
    As for your other opportunities, please provide some more information. For a start, post the contents of (decreasing priority): /proc/mtd, /proc/cpuinfo, /proc/partitions, /proc/mounts, /proc/iomem, /proc/interrupts and whatever else you consider useful

    UPD: Seems to cost over 100 GBP... Could be better at this price! And where do all those guys get SUCH old kernels?..
    The Unit is also known/sold as a Delstar DS700

    I got the same unit and it seems Ibsrom done something wrong:
    cat /proc/mtd
    dev: size erasesize name
    mtd0: 00040000 00040000 "Bootloader"
    mtd1: 001c0000 00040000 "Kernel"
    mtd2: 3f400000 00040000 "Root - YAFFS2/Datawind"
    mtd3: 00a00000 00040000 "File System"

    cat /proc/cpuinfo
    Processor : ARM926EJ-S rev 5 (v5l)
    BogoMIPS : 199.47
    Features : swp half fastmult edsp java
    CPU implementer : 0x41
    CPU architecture: 5TEJ
    CPU variant : 0x0
    CPU part : 0x926
    CPU revision : 5
    Cache type : write-back
    Cache clean : cp15 c7 ops
    Cache lockdown : format C
    Cache format : Harvard
    I size : 16384
    I assoc : 4
    I line length : 32
    I sets : 128
    D size : 16384
    D assoc : 4
    D line length : 32
    D sets : 128
    Hardware : SMDK2450
    Revision : 0000
    Serial : 0000000000000000

    cat /proc/partitions
    major minor #blocks name
    31 0 256 mtdblock0
    31 1 1792 mtdblock1
    31 2 1036288 mtdblock2
    31 3 10240 mtdblock3
    254 0 501248 mmcblk0
    254 1 128488 mmcblk0p1
    254 2 369495 mmcblk0p2

    cat /proc/mounts
    rootfs / rootfs rw 0 0
    /dev/root / yaffs2 rw 0 0
    proc /proc proc rw 0 0
    sysfs /sys sysfs rw 0 0
    devpts /dev/pts devpts rw 0 0
    tmpfs /tmp tmpfs rw 0 0
    /dev/mmc1 /mnt/sd vfat rw,sync,fmask=0022,dmask=0022,codepage=cp437,iocha rset=iso8859-1 0 0

    cat /proc/iomem
    20000000-3fffffff : smc911x
    30000000-33ffffff : System RAM
    30084000-30375fff : Kernel text
    30376000-303c723e : Kernel data
    38000000-3bffffff : System RAM
    49000000-490fffff : s3c2410-ohci
    49000000-490fffff : ohci_hcd
    49800000-498fffff : s3c2410-usbgadget
    4a800000-4a801000 : s3c-hsmmc.1
    4a800000-4a801000 : s3c-hsmmc
    4ac00000-4ac01000 : s3c-hsmmc.0
    4ac00000-4ac01000 : s3c-hsmmc
    4b800000-4b802000 : s3c-ide.0
    4c800000-4c8fffff : s3c-lcd
    4d800000-4d8fffff : s3c-camif
    4e000000-4e0fffff : s3c2410-nand
    4e000000-4e0fffff : s3c-nand
    50000000-50003fff : s3c2440-uart.0
    50000000-500000ff : s3c2440-uart
    50004000-50007fff : s3c2440-uart.1
    50004000-500040ff : s3c2440-uart
    50008000-5000bfff : s3c2440-uart.2
    50008000-500080ff : s3c2440-uart
    52000000-520fffff : s3c-spi.0
    52000000-520fffff : s3c-spi
    53000000-53000fff : s3c2410-wdt
    53000000-53000fff : s3c2410-wdt
    54000000-54000fff : s3c2410-i2c
    54000000-54000fff : s3c2410-i2c
    55000000-55000fff : s3c2410-iis
    57005000-570050ff : s3c2410-rtc
    57005000-570050ff : s3c2410-rtc
    58000000-58000fff : s3c2410-adc
    70100000-70100fff : onenand
    f0300000-f03fffff : s3c-lcd

    cat /proc/interrupts
    CPU0
    17: 1 s3c-ext0 s3c-hsmmc
    30: 175416 s3c S3C2410 Timer Tick
    36: 123 s3c s3c-hsmmc
    37: 7 s3c s3c-hsmmc
    38: 150 s3c s3c-spi
    42: 532558 s3c ohci_hcd:usb1
    43: 96045 s3c s3c2410-i2c
    48: 0 s3c-ext enc28j60
    51: 1 s3c-ext power_button
    52: 73 s3c-ext dw-keypad
    53: 104 s3c-ext dw-keypad
    54: 48 s3c-ext dw-keypad
    55: 17 s3c-ext dw-keypad
    56: 71 s3c-ext dw-keypad
    57: 26 s3c-ext dw-keypad
    58: 15 s3c-ext dw-keypad
    59: 11 s3c-ext dw-keypad
    73: 0 s3c-uart1 s3c2440-uart
    74: 3160 s3c-uart1 s3c2440-uart
    86: 57524 - s3c-lcd
    97: 0 - s3c2410-wdt
    98: 0 - AC97
    Err: 0

  8. #1028
    Join Date
    Sep 2010
    Beans
    4

    Re: Linux on 7" mini netbook ARM-VT8500 ?

    Quote Originally Posted by alchark View Post
    Can you read /etc/passwd and have you got /etc/shadow? Have you tried sudo?
    passwd:

    Code:
    root::0:0:root:/root:/bin/sh
    daemon:x:1:1:daemon:/usr/sbin:/bin/sh
    bin:x:2:2:bin:/bin:/bin/sh
    sys:x:3:3:sys:/dev:/bin/sh
    sync:x:4:100:sync:/bin:/bin/sync
    mail:x:8:8:mail:/var/spool/mail:/bin/sh
    proxy:x:13:13:proxy:/bin:/bin/sh
    www-data:x:33:33:www-data:/var/www:/bin/sh
    backup:x:34:34:backup:/var/backups:/bin/sh
    operator:x:37:37:Operator:/var:/bin/sh
    sshd:x:103:99:Operator:/var:/bin/sh
    nobody:x:99:99:nobody:/home:/bin/sh
    default:x:1000:1000:Default non-root user:/home/default:/bin/sh
    geveno:x:1001:1001:Linux User,,,:/home/geveno:/bin/sh
    sshd:x:2:2:sshd:/sbin:
    shadow:
    Code:
    root:$1$GR8b9sj8$Ing16n6h6awasaMQOOAH5/:10933:0:99999:7:::
    bin:*:10933:0:99999:7:::
    daemon:*:10933:0:99999:7:::
    adm:*:10933:0:99999:7:::
    lp:*:10933:0:99999:7:::
    sync:*:10933:0:99999:7:::
    shutdown:*:10933:0:99999:7:::
    halt:*:10933:0:99999:7:::
    uucp:*:10933:0:99999:7:::
    operator:*:10933:0:99999:7:::
    nobody:*:10933:0:99999:7:::
    default::10933:0:99999:7:::
    geveno:$1$d0G3xTY8$IITzv8p9ejGKA4A/cKFtj0:0:0:99999:7:::

  9. #1029
    Join Date
    Jan 2010
    Location
    Amsterdam, Netherlands
    Beans
    93

    Re: Linux on 7" mini netbook ARM-VT8500 ?

    Quote Originally Posted by DonutFUN View Post
    So I found something Kind of interesting out tonight, I have two VT8500 (neither are wm's or 05's) and even though they are the same, they are both different, there is one micro chip that on one is on the little removeable (Ram type) card, and on the other its sottered to teh board, and its obvious that it can be put in either spot on either, ill post pictures to show you what chip and where I'm talking about

    I hope its obvious which chip I'm talking about
    As far as i've been able to determine, the chip you're referring to is the 2 GigaBytes 'disk' (flash-disk) chip. Interesting to know that both are used sometimes. I don't know if there will be any difference between them: I've been thinking about putting a 2-nd 'disk'-chip on the 'spare' location in an attempt to increase the 'disk-space' of the machines....

  10. #1030
    Join Date
    Jun 2010
    Location
    Moscow, Russia
    Beans
    26

    Re: Linux on 7" mini netbook ARM-VT8500 ?

    Quote Originally Posted by SteffenBaier View Post
    cat /proc/cpuinfo
    Processor : ARM926EJ-S rev 5 (v5l)
    BogoMIPS : 199.47
    Features : swp half fastmult edsp java
    CPU implementer : 0x41
    CPU architecture: 5TEJ
    CPU variant : 0x0
    CPU part : 0x926
    CPU revision : 5
    Cache type : write-back
    Cache clean : cp15 c7 ops
    Cache lockdown : format C
    Cache format : Harvard
    I size : 16384
    I assoc : 4
    I line length : 32
    I sets : 128
    D size : 16384
    D assoc : 4
    D line length : 32
    D sets : 128
    Hardware : SMDK2450
    Revision : 0000
    Serial : 0000000000000000
    So the hardware seems to be a standard Samsung platform. You could use just any recent kernel and select ARCH_S3C2410 in configuration to make it work. Have you managed to get root access? Probably yes, as you are reading /etc/shadow If so, then just try to dump and examine the contents of mtd0 and mtd1 to get an idea of what kind of kernel image your bootloader expects and flash an appropriate replacement to mtd1.

    However, I would strongly advise to get serial/telnet access to the bootloader before replacing the kernel/rootfs and JTAG before touching the bootloader itself.

    Upd: Also note the fact that unpatched upstream kernels do not support YAFFS2, so you would need to take care about your root FS as well.
    Last edited by alchark; October 1st, 2010 at 05:58 AM.

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