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[U-Boot] arc: Don't halt slaves

Message ID 20180125180705.15914-1-abrodkin@synopsys.com
State Accepted, archived
Delegated to: Alexey Brodkin
Headers show
Series [U-Boot] arc: Don't halt slaves | expand

Commit Message

Alexey Brodkin Jan. 25, 2018, 6:07 p.m. UTC 
This commit basically reverts two previous commits:
 1. cf628f772ef2 ("arc: arcv1: Disable master/slave check")
 2. 6cba327bd96f ("arcv2: Halt non-master cores")

With mentioned commits in-place we experience more trouble than
benefits. In case of SMP Linux kernel this is really required as
we have all the cores running from the very beginning and then we
need to allow master core to do some preparatory work while slaves
are not getting in the way.

In case of U-Boot we:
 a) Don't really run more than 1 core in parallel
 b) We may use whatever core for that

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
---
 arch/arc/lib/start.S | 20 --------------------
 1 file changed, 20 deletions(-)
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Patch

diff --git a/arch/arc/lib/start.S b/arch/arc/lib/start.S
index 5098db9286fd..0d9c85741447 100644
--- a/arch/arc/lib/start.S
+++ b/arch/arc/lib/start.S
@@ -11,26 +11,6 @@ 
 #include <asm/global_data.h>
 
 ENTRY(_start)
-; ARCompact devices are not supposed to be SMP so master/slave check
-; makes no sense.
-#ifdef CONFIG_ISA_ARCV2
-	; Non-masters will be halted immediately, they might be kicked later
-	; by platform code right before passing control to the Linux kernel
-	; in bootm.c:boot_jump_linux().
-	lr 	r5, [identity]
-	lsr	r5, r5, 8
-	bmsk	r5, r5, 7
-	cmp	r5, 0
-	mov.nz	r0, r5
-	bz	.Lmaster_proceed
-	flag	1
-	nop
-	nop
-	nop
-
-.Lmaster_proceed:
-#endif
-
 	/* Setup interrupt vector base that matches "__text_start" */
 	sr	__ivt_start, [ARC_AUX_INTR_VEC_BASE]