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Blackfin: fix accidental reset in some boot modes

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We read the SWRST (Software Reset) register to get at the last reset
state, and then we may configure the DOUBLE_FAULT bit to control behavior
when a double fault occurs.  But if the lower bits of the register is
already set (like UART boot mode on a BF54x), we inadvertently make the
system reset by writing to the SYSTEM_RESET field at the same time.  So
make sure the lower 4 bits are always cleared.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Sonic Zhang 2009-06-15 07:39:19 +00:00 committed by Mike Frysinger
parent 81b79c213d
commit 0de4adfb8c
1 changed files with 2 additions and 1 deletions
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3
arch/blackfin/kernel/setup.c
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@ -837,7 +837,8 @@ void __init setup_arch(char **cmdline_p)
defined(CONFIG_BF538) || defined(CONFIG_BF539)
_bfin_swrst = bfin_read_SWRST();
#else
_bfin_swrst = bfin_read_SYSCR();
/* Clear boot mode field */
_bfin_swrst = bfin_read_SYSCR() & ~0xf;
#endif
#ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT