Originally Posted by buradd
how hard would it be to get this working on an HTC Desire HD/Inspire 4G?
Something between extremely hard and impossible. The way it works with WinMo(HaRET)/Magldr is very specific and tied to the device not only with the drivers. If you had a bootloader which worked similarly to magldr when it comes to booting from SD, you'd probably just have to get proper drivers for your device.
For native Linux on your device, I could only recommend getting a different phone.
Siemens C25 -> Nokia 3510i -> Nokia 6610 -> Nokia 6103 -> HTC Artemis -> HTC HD2 + iPod Touch 3G
My lovely Leo:
WP7 HD2O + ParanoidAndroid JB