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mpc85xx: Add support for -msingle-pic-base

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-msingle-pic-base is a new gcc(from 4.6) option for ppc and
it reduces the size of my u-boot with about 4-5 KB.
While at it, add -fno-jump-tables too to save a
few more bytes.

e5500 core:
size u-boot.bef
   text	   data	    bss	    dec	    hex	filename
 473043	  23772	 307104	 803919	  c444f	u-boot.bef
size u-boot.aft
   text	   data	    bss	    dec	    hex	filename
 453195	  23772	 307104	 784071	  bf6c7	u-boot.aft

e500 core:
size u-boot.bef
   text	   data	    bss	    dec	    hex	filename
 292998	  17868	  24968	 335834	  51fda	u-boot.bef
size u-boot.aft
   text	   data	    bss	    dec	    hex	filename
 288002	  17868	  24968	 330838	  50c56	u-boot.aft

Signed-off-by: Joakim Tjernlund <joakim.tjernlund@infinera.com>
Reviewed-by: York Sun <york.sun@nxp.com>
This commit is contained in:
Joakim Tjernlund 2018-12-06 17:20:53 +01:00 committed by York Sun
parent 7794fe2c8c
commit 45e81f9ab3
2 changed files with 4 additions and 0 deletions
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1
arch/powerpc/cpu/mpc85xx/config.mk
View File

@ -4,6 +4,7 @@
# Xianghua Xiao, X.Xiao@motorola.com
PLATFORM_CPPFLAGS += -Wa,-me500 -msoft-float -mno-string
PLATFORM_RELFLAGS += -msingle-pic-base -fno-jump-tables
# -mspe=yes is needed to have -mno-spe accepted by a buggy GCC;
# see "[PATCH,rs6000] make -mno-spe work as expected" on

3
arch/powerpc/cpu/mpc85xx/start.S
View File

@ -1216,6 +1216,9 @@ _start_cont:
mr r1,r3 /* Transfer to SP(r1) */
GET_GOT
/* Needed for -msingle-pic-base */
bl _GLOBAL_OFFSET_TABLE_@local-4
mflr r30
/* Pass our potential ePAPR device tree pointer to cpu_init_early_f */
mr r3, r24