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Diffstat (limited to 'arch/sh')
-rw-r--r--arch/sh/Kconfig.debug15
-rw-r--r--arch/sh/kernel/head_32.S12
2 files changed, 22 insertions, 5 deletions
diff --git a/arch/sh/Kconfig.debug b/arch/sh/Kconfig.debug
index 834a2d24342..eef2fa940ce 100644
--- a/arch/sh/Kconfig.debug
+++ b/arch/sh/Kconfig.debug
@@ -98,6 +98,18 @@ config IRQSTACKS
for handling hard and soft interrupts. This can help avoid
overflowing the process kernel stacks.
+config SH_NO_BSS_INIT
+ bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)"
+ depends on DEBUG_KERNEL
+ default n
+ help
+ If running in painfully slow environments, such as an RTL
+ simulation or from remote memory via SHdebug, where the memory
+ can already be gauranteed to ber zeroed on boot, say Y.
+
+ For all other cases, say N. If this option seems perplexing, or
+ you aren't sure, say N.
+
config MORE_COMPILE_OPTIONS
bool "Add any additional compile options"
help
@@ -125,9 +137,6 @@ config SH_ALPHANUMERIC
bool "Enable debug outputs to on-board alphanumeric display"
depends on SH_CAYMAN
-config SH_NO_BSS_INIT
- bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)"
-
endif
endmenu
diff --git a/arch/sh/kernel/head_32.S b/arch/sh/kernel/head_32.S
index ae0a382a82e..788605ff708 100644
--- a/arch/sh/kernel/head_32.S
+++ b/arch/sh/kernel/head_32.S
@@ -80,8 +80,14 @@ ENTRY(_stext)
mov.l 7f, r0
ldc r0, r7_bank ! ... and initial thread_info
#endif
-
- ! Clear BSS area
+
+#ifndef CONFIG_SH_NO_BSS_INIT
+ /*
+ * Don't clear BSS if running on slow platforms such as an RTL simulation,
+ * remote memory via SHdebug link, etc. For these the memory can be guaranteed
+ * to be all zero on boot anyway.
+ */
+ ! Clear BSS area
#ifdef CONFIG_SMP
mov.l 3f, r0
cmp/eq #0, r0 ! skip clear if set to zero
@@ -97,6 +103,8 @@ ENTRY(_stext)
mov.l r0,@-r2
10:
+#endif
+
! Additional CPU initialization
mov.l 6f, r0
jsr @r0