review.openocd Code Review - openocd.git/commit

author	Salvador Arroyo <sarroyofdez@yahoo.es>
	Sat, 23 Feb 2013 19:00:21 +0000 (20:00 +0100)
committer	Spencer Oliver <spen@spen-soft.co.uk>
	Tue, 2 Apr 2013 15:12:44 +0000 (15:12 +0000)
commit	1d040adb0dd838f4d49b87573ee912d5bc917886
tree	8e44c50d2c18f628a96c9134346d866553063396	tree \| snapshot
parent	c185a5b72437594a79894dccd7ef8851b5789307	commit \| diff

pic32mx: 0 wait state option

By default pic32mx starts after any reset with 1 wait state for RAM access/exec.
It can be changed to 0 wait states by clearing the BMXWSDRM bit (bit 6) in BMXCON register.
With 0 wait states near doubles the execution speed. CRC check sum can be done much faster
increasing verify_image speed. Fast data transfer also works with a bit higher scan rate, up to 1500 Khz.
This option can be set at any time with
mww 0xbf882004 0x40
or cleared with
mww 0xbf882008 0x40.
Some numbers for FTDI/HS with current devel code and a elf file:

Core clock / wait states              verify_image speed
------------------------------------|------------------------------

        4 Mhz    /    1                            21 KiB/s
        4 Mhz    /    0                            36 KiB/s
        8 Mhz    /    1                            37 KiB/s
        8 Mhz    /    0                            57 KiB/s

Change-Id: I4092ad0f3753f72f77108718d0ed3a3ab84e3b23
Signed-off-by: Salvador Arroyo <sarroyofdez@yahoo.es>
Reviewed-on: http://openocd.zylin.com/1141
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-by: Xiaofan <xiaofanc@gmail.com>

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