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| projects:zsun-wifi-card-reader:factory-update [2016/01/26 22:31] – informatic | projects:zsun-wifi-card-reader:factory-update [2016/02/19 18:21] – informatic |
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| ====== Zsun Card Reader Firmware Update Format ====== | ====== Zsun Card Reader Firmware Update Format ====== |
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| | **Note:** This method has been tested multiple times on our devices and worked without problem, however at least three unexpected bricks have been reported! (sounding like failed rootfs flash |
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| **TL;DR** | **TL;DR** |
| | - Insert FAT32-formatted microSD card (128MB is more than enough) |
| - Connect to WiFi | - Connect to WiFi |
| - http://10.168.168.1:8080/goform/Setcardworkmode?workmode=0 | - http://10.168.168.1:8080/goform/Setcardworkmode?workmode=0 |
| - Copy ''SD100-update.tar.gz'' (https://hackerspace.pl/~informatic/SD100-openwrt.tar.gz) to ''.update'' on SMB/Windows Share | - Create ''.update'' directory on Zsun SMB/Windows Share (on Windows call it ''.update.'', don't ask why - it'll work) and copy ''SD100-openwrt.tar.gz'' (https://hackerspace.pl/~informatic/SD100-openwrt.tar.gz) there |
| - http://10.168.168.1:8080/goform/upFirmWare | - http://10.168.168.1:8080/goform/upFirmWare |
| | - Wait for long LED flash, then multiple fast flashes - now OpenWRT is booting for the first time. |
| - ... PROFIT! | - ... PROFIT! |
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| | **Automatic flasher and builder:** https://code.hackerspace.pl/informatic/zsun-fw-tools |
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| ==== Technical description ==== | ==== Technical description ==== |
| ''/goform/upFirmWare'' reads update tarball from ''.update/'' directory on microSD card. (''/etc/disk/.update'') Sadly that directory is removed on mount by ''/sbin/lbd_mount'', thus it has to be uploaded using SMB/Windows Network Shares. ''/goform/upFirmWare'' handler is at ''.text:0x00405E04'' address in ''/var/webs/webs'' binary. It does multiple checks and then executes ''/etc/ath/update.sh'' which handles all the actual update. After that device is rebooted. | ''/goform/upFirmWare'' reads update tarball from ''.update/'' directory on microSD card. (''/etc/disk/.update'') Sadly that directory is removed on mount by ''/sbin/lbd_mount'', thus it has to be uploaded using SMB/Windows Network Shares. ''/goform/upFirmWare'' handler is at ''.text:0x00405E04'' address in ''/var/webs/webs'' binary. It does multiple checks and then executes ''/etc/ath/update.sh'' which handles all the actual update. After that device is rebooted. |
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| Furthermore ''S'' update action executes ''./mtd_write'' after entering ''/etc/disk/.update'' thus we have to bundle that with update package too. After flashing rootfs device will fail to reboot. | Furthermore ''S'' update action executes ''./mtd_write'' after entering ''/etc/disk/.update'' thus we have to bundle that with update package too. After flashing rootfs ''/sbin/reboot'' will fail. This is why we have minimal statically linked reboot executable. (''minreboot'') |
| | |
| | What we are basically doing is hijacking ''./mtd_write'' execution and doing our own calls to ''./mtd_write.actual'' (yes, actual ''mtd_write'' binary), and then just running ''/tmp/minreboot'' (copied there at the beginning of update script, since ''/tmp'' stays in ramfs) |
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| Expected update file format is: | Expected update file format is: |
| | -3 | MD5 mismatch | | | -3 | MD5 mismatch | |
| | 1 | Invalid version (''/etc/ver'', try to add 1) | | | 1 | Invalid version (''/etc/ver'', try to add 1) | |
| | 2 | **Update successful** | | | 2 | **Update successful** (also returned if ''update.sh'' failed!) | |
