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2003-09-29 Till Strauman <strauman@slac.stanford.edu>

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PR 497/bsps
	* ChangeLog, bootloader/head.S, startup/bspstart.c: Disable code that
	returned to the firmware when the loader starts.
	* startup/sbrk.c: New file.
This commit is contained in:
Joel Sherrill
2003-09-29 21:43:26 +00:00
parent 235beed85d
commit 20c214e3bc
3 changed files with 38 additions and 4 deletions
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28
c/src/lib/libbsp/powerpc/shared/ChangeLog
View File

@@ -1,3 +1,31 @@
2003-09-29 Till Strauman <strauman@slac.stanford.edu>
PR 497/bsps
* ChangeLog, bootloader/head.S, startup/bspstart.c: Disable code that
returned to the firmware when the loader starts.
* startup/sbrk.c: New file.
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

4
c/src/lib/libbsp/powerpc/shared/bootloader/head.S
View File

@@ -76,7 +76,7 @@
* code area, so that simple C routines can be called.
*/
start:
#if defined(USE_PPCBUG) && defined(DEBUG)
#if defined(USE_PPCBUG) && defined(DEBUG) && defined(REENTER_MONITOR)
MONITOR_ENTER
#endif
bl 1f
@@ -308,7 +308,7 @@ moved: lwz r1,stack(bd)
mtspr HID0,r0
/* Provisional return to FW, works for PPCBug */
#if 0
#if 0 && defined(REENTER_MONITOR)
MONITOR_ENTER
#else
1: bctr

10
c/src/lib/libbsp/powerpc/shared/startup/bspstart.c
View File

@@ -132,6 +132,8 @@ void bsp_pretasking_hook(void)
{
rtems_unsigned32 heap_start;
rtems_unsigned32 heap_size;
rtems_unsigned32 heap_sbrk_spared;
extern rtems_unsigned32 _bsp_sbrk_init(rtems_unsigned32, rtems_unsigned32*);
heap_start = ((rtems_unsigned32) __rtems_end) +INIT_STACK_SIZE + INTR_STACK_SIZE;
if (heap_start & (CPU_ALIGNMENT-1))
@@ -139,10 +141,14 @@ void bsp_pretasking_hook(void)
heap_size = (BSP_mem_size - heap_start) - BSP_Configuration.work_space_size;
heap_sbrk_spared=_bsp_sbrk_init(heap_start, &heap_size);
#ifdef SHOW_MORE_INIT_SETTINGS
printk(" HEAP start %x size %x\n", heap_start, heap_size);
printk(" HEAP start %x size %x (%x bytes spared for sbrk)\n", heap_start, heap_size, heap_sbrk_spared);
#endif
bsp_libc_init((void *) heap_start, heap_size, 0);
bsp_libc_init((void *) 0, heap_size, heap_sbrk_spared);
#ifdef RTEMS_DEBUG
rtems_debug_enable( RTEMS_DEBUG_ALL_MASK );