Hello,
this patch is the second part of my work to add flash memory programming 
support to gdb. Since the complete patch is large, it's split in 3 part for 
easier review.

First part added support for getting target memory map.

This patch:

   - Adds new target interfaces for working with flash.
   - Implements those interfaces for remote protocol, using
     previously discussed vFlashErase, vFlashWrite and vFlashDone packets.
   - Introduces new function target_write_memory_blocks, that can take
     several memory requests at once, and uses target memory map to
     property drive flash
   - Changes the 'generic_load' function to use the target_write_memory_blocks
     function.

This patch was hand-tested with a real hardware.

- Volodya

2006-07-18  Vladimir Prus  <vladimir@codesourcery.com>

	* Makefile.in (SFILES): Add target-memory.c.
	(COMMON_OBJS): Add target-memory.o.
	(target-memory.o): New, specify dependencies.
	* target.h (enum target_object): New value
	TARGET_OBJECT_FLASH.
	(struct target_ops): New methods to_flash_erase,
	and to_flash_done.
	(struct memory_write_request): New.
	(typedef target_write_memory_2_progress_cb): New
	(enum flash_preserve_mode): New.
	(target_flash_erase, target_flash_done)
	(target_write_memory_blocks): New.
	(target_write_partial): Declare.
	* target-memory.c: New.
	* symfile.c (add_section_size_callback): Remove.
	(struct load_section_data): New field memory_write_requests.
	Remove write_count, data_count, and total_size fields.
	(load_section_callback): Just record data to write, don't write.
	(allow_flash_write, dont_preserve_flash)
	(clear_memory_write_data): New.
	(donwload_progress_cb): New;        
	(generic_load): Don't compute total size. Don't do memory
	transfers here. Call target_write_memory_blocks.