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Linux Bootloader Tools for Compaq Evo Thin Client T30 Written by Dwayne C. Litzenberger http://www.dlitz.net/software/evo-netboot/ This package contains tools for creating and loading network-bootable Linux images that can be loaded on a Compaq Evo T30 using 100% free software and without any modification to the device's internal flash memory. Previous approaches were more cumbersome and required users to download and modify the manufacturer's proprietary firmware image. EXAMPLE: BUILDING AND LOADING A "FIRMWARE" IMAGE (AKA "bootp.bin") Note that although we are using the "firmware update" process, this software does not modify the Evo T30's flash memory. Of course, there is always a chance that your experience may differ from that of the author. If this software somehow damages your device, the author cannot be held responsible. (Though bug reports would be appreciated!) 1. Build boot/loader.bin make -C boot 2. Build your Linux bzImage file. 3. Create a file ("cmdline.txt") containing your Linux kernel command-line. You may want to consider the following options to enaable a serial console: earlyprintk=serial,ttyS0,115200 console=ttyS0,115200 console=tty0 video=gx1fb:1024x768-16@60 4. Build your bootp.bin file: ./mknbi-linux-netxfer -C cmdline.txt -o bootp.bin /path/to/bzImage 5. At this point, you can load the file using NetXfer. This package includes the script "netxfer-server" for your convenience as a simpler alternative to configuring and running full-blown DHCP and TFTP servers. If your server's address is 10.0.0.10 and your Evo's address is 10.0.0.22, then you can run the following command on your server (as root): ./netxfer-server -i eth0 -s 10.0.0.10 -c 10.0.0.22 bootp.bin 6. Connect a keyboard to your Evo T30 and power it on. The power light will turn amber, then flicker off and turn amber again as the keyboard is initialized. At that point, press 'P' on the keyboard. Your Evo should display something like this: NETXFER 09.73 10067 10068 10069 MAC address 00:80:64:xx:xx:xx Contacting Server (02) After a few moments, you should see the bootloader being downloaded and started. KNOWN ISSUES - The PCI IRQ ("$PIR") table is probably wrong, especially for the PCMCIA slot. This could be fixed: We just need to know how the INTA#-INTD# pins are wired on the board. - The fake (E820) memory map is hard-coded for a device with 32 MiB of RAM. It's wrong for devices with more memory, and it's probably overly conservative. (We don't have a BIOS, so we probably don't need to reserve the BIOS addresses.) - The bootloader assumes the kernel supports a recent version of the Linux 32-bit boot protocol (see Documentation/x86/boot.txt). Older kernels might not boot. (Version 2.6.28 is known to work.) - We don't supply any proprietary firmware, so the Geode Virtual System Architecture (VSA) code is missing. This means that we have to run without PC BIOS, Video BIOS, and XpressAudio firmware. The snd_cs5530 ALSA driver does not work, but there is apparently a native driver for FreeBSD that could be ported to Linux. See: http://www.coreboot.org/pipermail/coreboot/2006-May/014694.html http://alumni.cse.ucsc.edu/~brucem/gx_audio/ - The PCI configuration in general might be wrong, since I haven't yet looked at the PCI specifications. - The parallel port is untested. (The serial port works, though.) HARDWARE MODEL No.: T30 PART No.: 238620-001 SPARE No.: 272643-001 PC BOARD: 981048-01 REVB  - CPU: AMD/NatSemi Geode GX1 U2 - Southbridge: NatSemi CS5530A-UCE U3 - Ethernet: NatSemi DP83815DUJB U4 - CardBus: Texas Instruments PCI1410APGE U6 - SuperI/O: NatSemi PC97307-ICE/VUL U12 - AC'97 codec: NatSemi LM4546VH U22 - Flash: Toshiba TC58128AFT (16Mx8 CMOS NAND) LICENSING NOTE The bootloader image itself is licensed under GPLv2+ in order to avoid a potential incompatibilities with Linux's GPLv2-only license. However, the associated tools are licensed under the newer GPLv3+ license. See the respective files for details.