Thanks David
I'll add that to the tinyos msp430 stuff that I maintain
On Monday, March 18, 2013, David Brown wrote:
> Hi,
>
> This is just a tip for users of gdb and mspdebug - slow debugging had
> been annoying me, and it took me a while to find a solution. I had
> originally planned to ask about the issue here, but since I found the
> answer myself I thought I'd tell others about it.
>
>
> By default, gdb considers all memory areas to be non-cached (i.e., it
> reads them from the hardware every time it wants to show them) and uses
> native sized accesses. This means that if it wants to read code, such
> as to show the disassembly window, it has to do an awful lot of 2-byte
> reads from the chip - often reading the same address several times. As
> there is a certain latency for each read, this can mean long delays
> while everything is read and re-read (you can see this on the output of
> mspdebug).
>
> The way to avoid this is by memory regions. In the gdb setup, include
> two lines about memory:
>
>
> set remoteaddresssize 64
> set remotetimeout 999999
> set remote memory-write-packet-size 2048
> set remote memory-write-packet-size fixed
> set remote memory-read-packet-size 2048
> set remote memory-read-packet-size fixed
>
> set mem inaccessible-by-default off
> mem 0x2100 0x100000 ro 64 cache
>
>
> The exact range for the "ro 64 cache" memory area will depend on the
> chip you use, but it should cover the code flash. gdb will then know
> that it can use 64-byte reads in this area, and can remember the results
> - substantially cutting down on extra reads.
>
>
> mvh.,
>
> David
>
>
>
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