2003-09-26 Till Strauman <strauman@slac.stanford.edu>

	PR 496/bsps
	* startup/sbrk.c: New file.
	* startup/bspstart.c: This patch implements 'sbrk'
	for the powerpc-shared BSP to work around what's known as the
	'32Mb problem' in combination with run-time loaded code.
	GCC normally generates (PowerPC) code doing 'short jumps' which
	requires all text segments being in the same 32Mb area of memory.
	However, some run-time loaders use (e.g. heap-) memory violating the
	stated limitation on hardware with more than 32Mb of memory.
	(NOTE: portable loaders are probably not even aware of this
	GCC/CPU specific problem.)

	This patch implements a simple workaround: At boot time, the system is
	only provided with 32Mb of memory. The user is supposed to load all
	necessary modules prior to that limit being exhausted. Once that
	happens, newlib/malloc end up trying to 'sbrk()' for more memory and
	the implementation provided by this patch will then make the rest of
	the physical memory available.

0 files changed, 0 insertions, 0 deletions