Difference between revisions of "LPC2138"

Revision as of 13:26, 25 January 2009

OK, LPC2138 is an ARM7TDMI, 512kB flash, 32kB ram from NXP/Philips.

I'm doing it from zero, since I plan to write some super cool OS for it.

@@ Line 24: / Line 24: @@
 == arm exception vector locations ==
+Read all about that on:
 [[LPC2138/crt | Bootup, vectors and linker script]]
-ok, so these fuckers can be remapped:
- * boot loader mode (on start up), boot block vectors are mapped here
- * user flash mode (from boot code), activated by BL, needs valid program sig and non-forced BL. non re-mapped vectors (== stays in flash, bottom)
- * user ram mode (from program), user program can remap vectors to bottom of SRAM
-The 64-byte block is remapped. So some handlers can fit there.
-{| cellspacing="0" border="1"
+[[Category: Projects]]
-|+ arm vectors
-|-
-|0x0
-| Reset
-|-
-|0x4
-| Undefined Instruction
-|-
-|0x8
-| Software Interrupt
-|-
-|0xc
-| Prefetch Abort
-|-
-|0x10
-| Data Abort
-|-
-|0x14
-|2's complement of checksum of vectors
-|-
-|0x18
-|IRQ
-|-
-|0x1c
-|FIQ
-|}
-== after reset ==
-The 12kB boot block is mapped into 0x7d000. It's also visible at 0x7fff d000.
-Bootloader checks for valid checksum of vectors, then hands off control to flash at 0x0, or start serial port shit.