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authorSonic Zhang <sonic.zhang@analog.com>2009-06-15 07:39:19 +0000
committerMike Frysinger <vapier@gentoo.org>2009-06-22 21:15:48 -0400
commit0de4adfb8c9674fa1572b0ff1371acc94b0be901 (patch)
tree24ed2b515b7786b7ea29c0696f6f8fcd9a3d46b4 /arch
parent81b79c213d0200fdd16951a9fb18748fd511d810 (diff)
Blackfin: fix accidental reset in some boot modes
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/blackfin/kernel/setup.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index 6454babdfaf..b2782eae31e 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -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