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    • zwelch's avatar
      Further cleanup to MIPS target read/write memory function: · 7fdce0e8
      zwelch authored 
      - Move the mips32_..._read_mem calls to top-level of read_mem function.
- Change: Only perform mips_m4k_read_mem conversion when retval == ERROR_OK.  
   - Prevents pointless conversions of bogus read values after failures.
- Eliminate retval variable from mips_m4k_write_mem; return directly.
- Move declaration of retval variable to point of first use.
- Remove the now redundant switch statements testing size:
  - argument sanitizing already covers these cases.


git-svn-id: svn://svn.berlios.de/openocd/trunk@2220 b42882b7-edfa-0310-969c-e2dbd0fdcd60
      7fdce0e8
    • zwelch's avatar
      David Claffey <dnclaffey@gmail.com>: · c6e80f63
      zwelch authored 
      This patch helps fix MIPS big endian (elf32-tradbigmips) targets.
If "-endian big" is not set in target create, the endianess defaults to
little.  mw and md commands will still work, but binary file loads will
have the incorrect word order loaded into memory.

The EJTAG processor access data register (PrAcc) is little endian
regardless of the CPU endianness; it is always loaded LSB first. This
is confirmed by the fact that mips_ejtag_drscan_32() uses buf_set_u32()
to load the scan field; buf_set_u32() is a little-endian formatter. For
big endian targets, data buffers have to be modified so the LSB of each
u32 or u16 is at the lower (first) memory location.  If the drscan
out_value word order is set using buf_set_u32() then it makes sense to
also fixup the in_value with buf_get_u32(); a symmetry argument. This
has no affect on little endian hosts.


git-svn-id: svn://svn.berlios.de/openocd/trunk@2219 b42882b7-edfa-0310-969c-e2dbd0fdcd60
      c6e80f63
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