arm: armv7-a: Enable mtune when CONFIG_CPU_V7A

PATCH New Adam Ford 2 participants 2 messages Aug 3, 2018 Arm (32-bit)

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Adam Ford

author

2018-08-03 10:23 UTC #0 lore raw

PATCH 1/1 arm: armv7-a: Enable mtune when CONFIG_CPU_V7A

arch/arm/Makefile has a list of options for mtune, but the entry for CONFIG_CPU_V7A is empty. By tuning for generic-armv7-a both the size of SPL and u-boot shrink a little. For those with limited resources in SPL, every little bit helps.

The following size changed apply to omap3_logic

Original:
text data bss dec hex filename
541198 22692 327040 890930 d9832 u-boot

text data bss dec hex filename
50964 429 67580 118973 1d0bd spl/u-boot-spl

With -mtune=generic-armv7-a
text data bss dec hex filename
540934 22692 327056 890682 d973a u-boot

text data bss dec hex filename
50972 429 67580 118981 1d0c5 spl/u-boot-spl

Signed-off-by Adam Ford <[email protected]>

arch/arm/Makefile +1 -1

index cac58bdc4d..b9f0903f9b 100644
@@ -40,7 +40,7 @@ tune-$(CONFIG_CPU_SA1100)	=-mtune=strongarm1100
 tune-$(CONFIG_CPU_PXA)		=-mcpu=xscale
 tune-$(CONFIG_CPU_ARM1136)	=
 tune-$(CONFIG_CPU_ARM1176)	=
-tune-$(CONFIG_CPU_V7A)		=
+tune-$(CONFIG_CPU_V7A)		=-mtune=generic-armv7-a
 tune-$(CONFIG_CPU_V7R)		=
 tune-$(CONFIG_ARM64)		=

Signature · 1 line

2.17.1

Tom Rini

2018-08-03 13:56 UTC #1 lore raw

PATCH 1/1 arm: armv7-a: Enable mtune when CONFIG_CPU_V7A

Quoted 28 lines · Adam Ford

arch/arm/Makefile has a list of options for mtune, but the entry for CONFIG_CPU_V7A is empty. By tuning for generic-armv7-a both the size of SPL and u-boot shrink a little. For those with limited resources in SPL, every little bit helps.
The following size changed apply to omap3_logic
Original:
text data bss dec hex filename
541198 22692 327040 890930 d9832 u-boot
text data bss dec hex filename
50964 429 67580 118973 1d0bd spl/u-boot-spl
With -mtune=generic-armv7-a
text data bss dec hex filename
540934 22692 327056 890682 d973a u-boot
text data bss dec hex filename
50972 429 67580 118981 1d0c5 spl/u-boot-spl
Signed-off-by Adam Ford <[email protected]>
arch/arm/Makefile +0 -0
index cac58bdc4d..b9f0903f9b 100644

arch/arm/Makefile tune-$(CONFIG_CPU_SA1100) =-mtune=strongarm1100 · line 45

Quoted 7 lines

arch/arm/Makefile +1 -1

@@ -40,7 +40,7 @@ tune-$(CONFIG_CPU_SA1100)	=-mtune=strongarm1100
 tune-$(CONFIG_CPU_PXA)		=-mcpu=xscale
 tune-$(CONFIG_CPU_ARM1136)	=
 tune-$(CONFIG_CPU_ARM1176)	=
-tune-$(CONFIG_CPU_V7A)		=
+tune-$(CONFIG_CPU_V7A)		=-mtune=generic-armv7-a
 tune-$(CONFIG_CPU_V7R)		=
 tune-$(CONFIG_ARM64)		=

I think we might need to use cc-option here. We have that around the arch portion due to llvm using 'armv7' not 'armv7-a'.

Signature · 8 lines

Tom
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