Want to get rid of that t-mobile boot image?
Disconnect, over at Gotontheinter.net, has figured out how to do it using the new unlocked bootloader from the g1 dev phone. Below is a quote from the source. ( http://www.gotontheinter.net/node/9 )
"So you want to join the party and flash your own boot image, but its a weird undocumented format and you don't want to spend all year researching it in the source. Well, I'm here to help.
It is actually very simple. Start with an image you want to use, make sure it is 320x480 with 8bpp color. (In my examples, I'll use splash.png: PNG image data, 320 x 480, 8-bit/color RGBA, non-interlaced
Just make sure you have ImageMagick installed, and the utilities from the source build. (Specifically, rgb2565.)
$ convert -depth 8 splash.png rgb:splash.raw
# Make sure it is 460800 bytes long!
$ rgb2565 < splash.raw > splash.raw565
# Triple-check size before flashing! 307200 bytes
$ fastboot flash splash1 splash.raw565
$ fastboot reboot
Lets break it down. the convert turns it from a png (or any supported image format) into a raw 8-bits-per-color no-alpha data file. This file should be 460800 bytes - no more, no less.
Next, rgb2565 converts that file to a raw 565 16bit file (for the framebuffer on the G1.) This file is exactly 307200 bytes long - if its not, you messed up somewhere.
Finally, you use fastboot to flash the splash image and reboot. Instead of the B&W T-mobile logo, now you will see your custom splash screen. Congrats! "
Thanks to Infernix for the following extended how to:
1. find an image you like
2. edit it with your favourite editing suite and scale it to 320x480
3. after scaling it, convert the colorspace to 256 colors (8-bit)
4. Save it as a PNG without alpha channel/transparency.
5. Use the convert tool from the ImageMagick toolkit (use cygwin, or a linux box): convert -depth 8 splash.png rgb:splash.raw
6. Check that the splash.raw file is exactly 460800 bytes!
7. Compile the android tool called rgb2565 (gcc -O2 -Wall -Wno-unused-parameter -o rgb2565 to565.c)
8. Run the conversion command: rgb2565 < splash.raw > splash.raw565
9. Check that splash.raw565 is 307200 bytes. if it isn't, DO NOT FLASH IT ON YOUR PHONE. double-check your steps, something went wrong.
10. Boot your phone in SPL mode (hold camera +power).
11. After SPL shows, plug in USB connector/cord/whateva and push trackball or hit back. SPL restarts and now shows FASTBOOT.
12. If on windows, you need to install http://dl.google.com/android/android_usb_windows.zip
13. Compile android (see http://source.android.com/download) and make sure the fastboot binary (mydroid/out/host/*/bin/fastboot) is compiled (* being your OS)
14. use fastboot devices to check whether if your phone is showing up. if it isn't, try it as root (user might not have permission to access the usb device).
15. Double check that splash.raw565 is 307200 bytes. if it isn't, DO NOT FLASH IT ON YOUR PHONE.
16. Flash the splash image: fastboot flash splash1 splash.raw565
17. Reboot your phone to check: fastboot reboot
The instructions below are for users trying to flash their own boot image using windows.
The instructions below are also JF's work and not my own:
(note: you have to check the USB device in Computer Manager when the phone is in fastboot mode. The computer sees the phone in fastboot mode as a different device than the phone in normal mode)
Download the file and extract it in the same folder as adb. (if you don't have adb yet, it's included in the android SDK for windows. go download it!)
Take out the usb cable and boot up your phone into the SPL (back + power). You have to have the dev bootloader for this to work (white background with 3 skateboarding androids).
Plug in the usb cable, and make sure the display on the phone changes from "Serial0" to "FASTBOOT". If it doesn't, try pressing the back button.
If it asks you to install drivers, then go ahead and use the same usb drivers that you used to get adb working. You can skip the rest of the instructions. Fastboot should be working for you now.
If it doesn't ask you to install a driver, you need to figure out if the correct driver is loaded already.
Right click on My Computer, and click Manage, then go to the device manager
If you see an "ADB Interface" category at/near the top, with "HTC Dream" under it, then you're good to go. Fastboot should be working for you.
If you don't see an "ADB Interface" category, then it's likely that windows loaded the USB Mass Storage driver for it automatically. In the device manager, go down to "Universal Serial Bus Controllers", and see if you have at least one "USB Mass Storage device". If you have multiple ones, you'll need to go through each to find the correct one.
To find the correct one, right click on the USB Mass Storage device and click Properties. Go to the Details tab. In the combo box at the top that says "Device Instance Id", bring up the pull down and choose "Compatible Ids". If that is the correct device, then you will see 3 entries:
Once you find the correct device, go to the driver tab, and click "Update Driver". Choose "No, not this time", then "Install from a list or specific location", then "Don't search, I will choose the driver to install", and then choose the same usb driver that you used to get adb to work.
After that's done, you should be good to go. Open a command prompt and type fastboot devices and it should list the phone.
Here is a very good set of instructions for applying this to your phone if you haven't gotten it already: http://forum.xda-developers.com/showthread.php?t=467064
another way to convert to 565 raw, but from ANY format, is to use ffmpeg like so:
ffmpeg -i input.png -f rawvideo -pix_fmt rgb565 output.565
where input.png could be jpg, gif, tiff, etc. whatever you want.
credits for this goes to
Heres some info about FFmpeg and where you can download it: FFmpeg