The Compaq Evo T20 is a thin-client device targetted at Windows TS or Citrix TS services.
The 192/256 and 256/256 models have WinXPe on them, the other models have WinNTe.
It appears that the driver XOrg uses for this unit can't support a bit depth of 24bits, but it does support 16bits.
The 64/64 model has an image for WinNTe + PXE, which can be downloaded from Compaq's website. The WinXPe models appear to both support PXE boot. If you don't have one of these models, the other models can be made to PXE boot by modifying the firmware.
You need a program called netxfer, available from Compaq's download site. This needs MS Java, however, which is not available from MS anymore. Try 
http://java-virtual-machine.net/download.htm
Interestingly, if you allow the bootp to wait, it times out after an hour and tries to tftp /tftpboot/kernel on port 10069.
If you don't have a PXE boot model, or you wish to run linux locally, you could look at what is meant to be a master reference for Linux on the Evo T20 - this has a mailling list and links to hacking the firmware and DEvoSL - DSL on Evo T20 HowTo
tried the stuff above - i'm not really a hacker - but ... yes it works !
my way:
since i saw a cheap t20 on ebay i've looked for information to run linux/bsd on this machine, then i found the solution from Dag Sverre and got a t20 with 96/128 memory configuration fom ebay (30$).
first i've downloaded the firmware-image (U96CPQ163.bin) from hp-support-site and compared it with the 48/64-imgefile from Dags machine: the offset differs, while it seems to be exactly the same stuff is contained and loaded up before starting up the NTe-Image (don't ask me).
# for the entire file:
losetup -o 834236 /dev/loop0 U96CPQ163.bin
# for the contained ntfs-filesystem
losetup -o 834748 /dev/loop1 U96CPQ163.bin
mount -t ntfs /dev/loop1 /mountpoint
cd /mountpoint
ls -l
http://marc.herbert.free.fr/linux/win2linstall.html#grub-for-nt
but neither i can't edit the boot.ini file nor i can't write a "menu.lst"-file to the filesystem (file truncated, no rights ...)
... probing on a standard-machine: the default-entry in boot.ini seems to be useless, while the NT-startup-routine allways tries to boot up the NT-environment, also when i put the c:\grldr="Start GRUB" to this position (it would be fine, if somebody could explain me the sense of the default-entry in boot.ini) (... another problem there's no keyboard available on a t20 at this moment to change to the grub entry - with legacy keyboard support this no problem ... but for my evo-t20 - no way!)
commented out the A20-calls in "builtins.c" and "common.c" patched the other files as described (maybe i have forget/ignored to comment out the routine itself in "asm.S" - don't know if this is nessesary) and wrote the preset-menu (may be i failed here - i wrote all in the same row - shit!)
after compiling, patching
dd if=my-compiled-grub-src/stage1/stage1 of=/dev/loop0 bs=512 seek=1
dd if=my-compiled-grub-src/stage2/stage2 of=/dev/loop0 bs=512 seek=2
and flashing (with netxfer)... and rebooting ...
... the machine waited for me at the grub command-prompt (no preset-menu) ... without having a keyboard - kacke!
(but which kind of it?) after testing with version 5.4.1 as a floppy bootable ROM-Image (.zdsk) and Binary ROM-Image (.zrom) i tried a HD-Image (experimental)(.zhd) but forget to enable "direct-PCI-Support" (machine boots up (hooray) ... and - no wonder - can't find a NIC) ... after enabling Direct-PCI i got a compiler-error
1. natsemi:dp83815 -- 0x100b,0x0020
2. HD (experimental) Hard Disk Partition Image (.zhd)
3. default-values + CONFIG_PCI_DIRECT
and got a "eb-5.4.2pre2-natsemi.zhd"
dd if=eb-5.4.2pre2-natsemi.zhd of=/dev/loop0 bs=512 seek=1
then i have flashed the patched U96CPQ163.bin to my t20 ... rebooted ... and:
i hope the hardest part is done. next days i will try to boot some LinTS-images and my own bsd-stuff for building a diskless FreeRADIUS-Server and a RDP/X-Client ... will tell you about my experiences
floaty
bootscreen:
the bitmap from bootup is ugly :
http://mitglied.lycos.de/szeissig/bilch.bmp
my screen is not really beautifull but inspired (from this web-site) :
http://mitglied.lycos.de/szeissig/bilch-patch.bmp
patching the bitmap is easy:
http://downloads.2x.com/pxes/1.1.1/PREBUILT/
P192168100251# dmesg
Linux version 2.4.32-2pxes (diego@thindev) (gcc version 3.3.5 (Debian 1:3.3.5-8)) #3 Tue Feb 21 18:02:22 EST 2006
BIOS-provided physical RAM map:
BIOS-e801: 0000000000000000 - 000000000009f000 (usable)
BIOS-e801: 0000000000100000 - 0000000007d10000 (usable)
125MB LOWMEM available.
On node 0 totalpages: 32016
zone(0): 4096 pages.
zone(1): 27920 pages.
zone(2): 0 pages.
DMI not present.
ACPI: Unable to locate RSDP
Kernel command line: rw root=/dev/nfs ramdisk_size=17080 initrd=pxes-1.1-1PB.squash ro root=/dev/ram
Initializing CPU#0
Working around Cyrix MediaGX virtual DMA bugs.
Detected 300.683 MHz processor.
Console: colour VGA+ 80x25
Calibrating delay loop... 599.65 BogoMIPS
Memory: 106808k/128064k available (1351k kernel code, 20868k reserved, 528k data, 108k init, 0k highmem)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Dentry cache hash table entries: 16384 (order: 5, 131072 bytes)
Inode cache hash table entries: 8192 (order: 4, 65536 bytes)
Mount cache hash table entries: 512 (order: 0, 4096 bytes)
Buffer cache hash table entries: 4096 (order: 2, 16384 bytes)
Page-cache hash table entries: 32768 (order: 5, 131072 bytes)
Working around Cyrix MediaGX virtual DMA bugs.
CPU: After generic, caps: 00808131 00818131 00000000 00000001
CPU: Common caps: 00808131 00818131 00000000 00000001
CPU: NSC Geode(TM) Integrated Processor by National Semi stepping 02
Checking 'hlt' instruction... OK.
POSIX conformance testing by UNIFIX
ACPI: Subsystem revision 20040326
ACPI: Interpreter disabled.
PCI: Using configuration type 1
PCI: Probing PCI hardware
PCI: Probing PCI hardware (bus 00)
PCI: Fixup for MediaGX/Geode Slave Disconnect Boundary (0x41=0x9c)
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
Starting kswapd
devfs: v1.12d (20021015) Richard Gooch (rgooch@atnf.csiro.au)
devfs: boot_options: 0x1
Squashfs 2.2-r2 (released 2005/09/08) (C) 2002-2005 Phillip Lougher
intelfb: Framebuffer driver for Intel(R) 830M/845G/852GM/855GM/865G chipsets
intelfb: Version 0.7.7, written by David Dawes <dawes@tungstengraphics.com>
tridentfb: Trident framebuffer 0.7.5 initializing
keyboard: Timeout - AT keyboard not present?(ed)
keyboard: Timeout - AT keyboard not present?(f4)
pty: 256 Unix98 ptys configured
Serial driver version 5.05c (2001-07-08) with MANY_PORTS SHARE_IRQ SERIAL_PCI enabled
RAMDISK driver initialized: 16 RAM disks of 17080K size 1024 blocksize
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 8192 bind 16384)
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
RAMDISK: squashfs filesystem found at block 0
RAMDISK: Loading 17078 blocks [1 disk] into ram disk... done.
Freeing initrd memory: 17128k freed
VFS: Mounted root (squashfs filesystem) readonly.
Mounted devfs on /dev
Freeing unused kernel memory: 108k freed
usb.c: registered new driver usbdevfs
usb.c: registered new driver hub
usb-uhci.c: $Revision: 1.275 $ time 18:01:58 Feb 21 2006
usb-uhci.c: High bandwidth mode enabled
usb-uhci.c: v1.275:USB Universal Host Controller Interface driver
PCI: Setting latency timer of device 00:13.0 to 64
usb-ohci.c: USB OHCI at membase 0xc00cc000, IRQ 6
usb-ohci.c: usb-00:13.0, Compaq Computer Corporation ZFMicro Chipset USB
usb.c: new USB bus registered, assigned bus number 1
hub.c: USB hub found
hub.c: 2 ports detected
usb.c: registered new driver hid
hid-core.c: v1.8.1 Andreas Gal, Vojtech Pavlik <vojtech@suse.cz>
hid-core.c: USB HID support drivers
mice: PS/2 mouse device common for all mice
hub.c: new USB device 00:13.0-1, assigned address 2
hub.c: USB hub found
hub.c: 4 ports detected
hub.c: new USB device 00:13.0-1.2, assigned address 3
input: USB HID v1.10 Keyboard [ USB Keyboard] on usb1:3.0
input: USB HID v1.10 Device [ USB Keyboard] on usb1:3.1
hub.c: new USB device 00:13.0-1.3, assigned address 4
input: USB HID v1.10 Mouse [05e3:1205] on usb1:4.0
natsemi dp8381x driver, version 1.07+LK1.0.17, Sep 27, 2002
originally by Donald Becker <becker@scyld.com>
http://www.scyld.com/network/natsemi.html
2.4.x kernel port by Jeff Garzik, Tjeerd Mulder
eth0: NatSemi DP8381[56] at 0xc883d000, 00:80:64:1e:48:f3, IRQ 10.
eth0: link up.
usb-uhci.c: $Revision: 1.275 $ time 18:01:58 Feb 21 2006
usb-uhci.c: High bandwidth mode enabled
usb-uhci.c: v1.275:USB Universal Host Controller Interface driver
inserting floppy driver for 2.4.32-2pxes
Floppy drive(s): fd0 is unknown type 7 (usb?), fd1 is 360K PC
floppy0: Unable to grab IRQ6 for the floppy driver
SCSI subsystem driver Revision: 1.00
Initializing USB Mass Storage driver...
usb.c: registered new driver usb-storage
USB Mass Storage support registered.
Uniform Multi-Platform E-IDE driver Revision: 7.00beta4-2.4
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
isapnp: Scanning for PnP cards...
isapnp: No Plug & Play device found
Soundblaster audio driver Copyright (C) by Hannu Savolainen 1993-1996
sb: No ISAPnP cards found, trying standard ones...
SB 4.12 detected OK (220)
Too much work in interrupt on uart401 (0x330). UART jabbering ??
parport0: PC-style at 0x3bc [PCSPP(,...)]
parport1: PC-style at 0x378 [PCSPP(,...)]
parport2: PC-style at 0x278 [PCSPP(,...)]
lp0: using parport0 (polling).
lp1: using parport1 (polling).
lp2: using parport2 (polling).
P192168100251#
I tried patching the firmware
and received a ~22.54k eb-5.4.2-natsemi.zhd .
I used dd to patch my stock binfile:
dd if=/tmp/eb-5.4.2-natsemi.zhd of=/tftpboot/evo/U48CPQ163.bin
However, the unit hates this new, very small file:
May 24 01:43:38 fishy in.tftpd[5271]: RRQ from 192.168.0.125 filename /tftpboot/evo/U48CPQ163.bin
repeated about 50 times per second
the old binfile is 48544412b; this new one is 23594b. Is that as much a concern as I think it is?
Anyway, my 48/64 is still unhappy. I even got desperate and random:
Uploading /tftpboot/evo/pxes-1.2-2PB-2.6.nbi [4002](02)
Upload Successful [4002](01)
And nothing more....
... it seems, that you have tried to patch direct into the org.-firmware-file and without offset ...
set up a loopdevice as decribed above:
losetup -o 834198 /dev/loop0 firmware.bin
# 834198 is the offset for the 48/64-T20
# other mem-configs use firmware with different offsets
# you can identify the ntfs-partition-header with a hex-editor
# have a look in the 48/64-Firmware and compare the pattern with your
# machine-specific firmware-file
and then
dd if=etherboot-image.zhd of=/dev/loop0 bs=512 seek=1
now the patch is written to the right position in the mounted firmware-file and you can send this file to your machine
floaty
ps.: the mofu's from lycos have killed my account, so my splash-screens are no longer online
2 pages link to CompaqEvoT20Notes:
