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| author | Joel Sherrill <joel.sherrill@OARcorp.com> | 2003-09-26 20:43:22 +0000 |
|---|---|---|
| committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 2003-09-26 20:43:22 +0000 |
| commit | 92b67b18d78f9822dcd58c018c130e4bd986986b (patch) | |
| tree | df313cd1b79049b08ed607e2861947c5fcc2a845 /c/src/lib/libbsp/powerpc/shared/ChangeLog | |
| parent | 2003-09-26 Till Straumann <strauman@slac.stanford.edu> (diff) | |
| download | rtems-92b67b18d78f9822dcd58c018c130e4bd986986b.tar.bz2 | |
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.
Diffstat (limited to 'c/src/lib/libbsp/powerpc/shared/ChangeLog')
| -rw-r--r-- | c/src/lib/libbsp/powerpc/shared/ChangeLog | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/powerpc/shared/ChangeLog b/c/src/lib/libbsp/powerpc/shared/ChangeLog index 7443efbdf7..bec24b2a92 100644 --- a/c/src/lib/libbsp/powerpc/shared/ChangeLog +++ b/c/src/lib/libbsp/powerpc/shared/ChangeLog @@ -1,3 +1,24 @@ +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. + 2003-09-26 Till Straumann <strauman@slac.stanford.edu> PR 497/bsps |