Severe bug in Pracc code
authorSalvador Arroyo <sarroyofdez@yahoo.es>
Sun, 5 Aug 2012 09:18:27 +0000 (11:18 +0200)
committerFreddie Chopin <freddie.chopin@gmail.com>
Fri, 24 Aug 2012 16:53:25 +0000 (16:53 +0000)
commit47728f92159e11668a4aa1ec3d2713ee38a87192
tree020cee562bf5148a5faece978e297d7789f36f3d
parent63a23e6fc862b94f00e0833ab474bd02901a019f
Severe bug in Pracc code

The function  wait_for_pracc_rw() fails if Pracc bit is 0.
The variable ejtag_ctrl is loaded with the content of the
control register in the first scan.
In the second scan Pracc bit is scanned out as 0, letting
the proccesor go. The result is unpredictable.

All the strange data corruption when scanning at certain
frequencies, or the strange delays needed when entering
or leaving fasdata area are retated to this bug.

Now the code works at any scan frequency, tested up to 15000Khz
and indepently of processor speed, tested at 31.25Khz and 4/8Mhz.

Change-Id: Iedfd81d06d6af4bc738a521f720e42323025b268
Signed-off-by: Salvador Arroyo <sarroyofdez@yahoo.es>
Reviewed-on: http://openocd.zylin.com/769
Tested-by: jenkins
Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>
src/target/mips32_pracc.c

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