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Blackfin: workaround anomaly 05000227

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Workaround anomaly 05000227 by only using the scratch pad for stack when
absolutely necessary.  The core code which reprograms clocks really only
touches MMRs directly with constants.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2009-04-24 03:55:41 +00:00
parent a9031028ef
commit 729a3fa733
1 changed files with 11 additions and 7 deletions
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18
arch/blackfin/mach-common/head.S
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@ -30,8 +30,6 @@ ENTRY(__init_clear_bss)
rts;
ENDPROC(__init_clear_bss)
#define INITIAL_STACK (L1_SCRATCH_START + L1_SCRATCH_LENGTH - 12)
ENTRY(__start)
/* R0: argument of command line string, passed from uboot, save it */
R7 = R0;
@ -148,8 +146,8 @@ ENTRY(__start)
#endif
/* Initialize stack pointer */
sp.l = lo(INITIAL_STACK);
sp.h = hi(INITIAL_STACK);
sp.l = _init_thread_union;
sp.h = _init_thread_union;
fp = sp;
usp = sp;
@ -189,7 +187,15 @@ ENTRY(__start)
/* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
call _bfin_relocate_l1_mem;
#ifdef CONFIG_BFIN_KERNEL_CLOCK
/* Only use on-chip scratch space for stack when absolutely required
* to avoid Anomaly 05000227 ... we know the init_clocks() func only
* uses L1 text and stack space and no other memory region.
*/
# define KERNEL_CLOCK_STACK (L1_SCRATCH_START + L1_SCRATCH_LENGTH - 12)
sp.l = lo(KERNEL_CLOCK_STACK);
sp.h = hi(KERNEL_CLOCK_STACK);
call _init_clocks;
sp = usp; /* usp hasnt been touched, so restore from there */
#endif
/* This section keeps the processor in supervisor mode
@ -243,9 +249,7 @@ ENTRY(_real_start)
call _cmdline_init;
/* Load the current thread pointer and stack */
sp.l = _init_thread_union;
sp.h = _init_thread_union;
p1 = THREAD_SIZE (z);
p1 = THREAD_SIZE + 4 (z); /* +4 is for reti loading */
sp = sp + p1;
usp = sp;
fp = sp;