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authorTom2012-01-11 17:00:30 +0100
committerTom2012-01-11 17:00:30 +0100
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+
+The Compal E88 supports the common Compal RAM linkages.
+These operate entirely from the Calypso internal RAM.
+
+Flash linkages are structured as follows:
+
+ e88loader:
+ Linked at address of original compal application (0x2000).
+ Provides interrupt vectors as expected by compal loader.
+ Allows interrupt redirection (XXX to where?).
+
+ We introduce this for the following reasons:
+ 1. We want to start our app at 0x10000, because that
+ is the first flash page after the loader page, allowing
+ us a higher degree of "unbrickability" by never reflashing
+ the bootloader.
+ 2. We want to keep the compal loader so we do not need even
+ more boot options and to allow recovery of original firmware.
+ 3. When there is a custom app in flash at 0xFFFF, just turning
+ the phone on with the compal loader would jump into an incomplete
+ motorola app. That might not even allow turning the phone off.
+ The loader provides this functionality.
+ 4. We do not want to patch the compal loader for interrupt
+ redirect and entry vectors. So we need to place something between
+ 0x2000 and 0x10000 anyway. And since there is space, why not put
+ the whole loader in there.
+ 5. This loader has a good chance of being able to read crash buffers.
+ and examining RAM without it being clobbered by a ram upload.
+
+ e88flash:
+ Our main application linkage, starting at 0x10000 and going through
+ all of flash. Data storage locations are still to be determined.
+