diff options
| -rw-r--r-- | arch/sh/Kconfig.debug | 15 | ||||
| -rw-r--r-- | arch/sh/kernel/head_32.S | 12 |
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 |