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Old 01-20-2009, 07:01 PM
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Re: New XIP for 21109 sys with working encryption

Quote:
Originally Posted by jakdillard View Post
Encrpytion is removed because on some device like the mogul it would corrupt your storage card ... this practiced is just still used today .... the catch filter if you choose to keep it you can move it to imgfs .... most times something is removed to save space or move modules around to take advantage of free RAM that is out there or to gain space in imgfs there are plenty of modules in the OEMXIPKernal and MSXIPkernal that can be moved to imgfs or deleted completely the key is to trim XIP
OK - you've got me intrigued. I assume that reducing the size of XIP would save RAM, and us Verizon folks need all we can get. But the whole XIP image is ~3MB - how much could we really save?

What modules in particular are not needed at early boot and can be moved out of XIP?

I did try loading mencfilt only on the SD card FATFS and it didn't work. According to MS it has to load on every FATFS volume. SInce the first FATFS volume loaded is the root on FLASHDRV, I assumed it had to load at that time. What I didn't try was loading it in the same manner in the registry, but not in boot.hv - loading it instead in the normal registry. If that worked it would remove it from XIP. Anyone out there with a ROM without working encryption and without this new XIP want to try an experiment and report back? If it can indeed be made to work and not be part of XIP, I'll re-cook a new one without it.
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