mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-02 08:13:44 +09:00
a67ef280f4
This way we may have very limited set of functions implemented so we save some space. Also it allows us to build U-Boot for any ARC core with the same one toolchain because we don't rely on pre-built libgcc. For example: * we may use little-endian toolchain but build U-Boot for ether endianess * we may use non-multilibbed uClibc toolchain but build U-Boot for whatever ARC CPU flavour that current GCC supports Private libgcc built from generic C implementation contributes only 144 bytes to .text section so we don't see significant degradation of size: --->8--- $ arc-linux-size u-boot.libgcc-prebuilt text data bss dec hex filename 222217 24912 214820 461949 70c7d u-boot.libgcc-prebuilt $ arc-linux-size u-boot.libgcc-private text data bss dec hex filename 222361 24912 214820 462093 70d0d u-boot.libgcc-private --->8--- Also I don't notice visible performance degradation compared to pre-built libgcc (where at least "*div*" functions are had-written in assembly) on typical operations of downloading 10Mb uImage over TFTP and bootm. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
51 lines
990 B
Makefile
51 lines
990 B
Makefile
#
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# Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
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#
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# SPDX-License-Identifier: GPL-2.0+
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#
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ifndef CONFIG_CPU_BIG_ENDIAN
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CONFIG_SYS_LITTLE_ENDIAN = 1
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else
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CONFIG_SYS_BIG_ENDIAN = 1
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endif
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ifdef CONFIG_SYS_LITTLE_ENDIAN
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ARC_CROSS_COMPILE := arc-buildroot-linux-uclibc-
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PLATFORM_LDFLAGS += -EL
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PLATFORM_CPPFLAGS += -mlittle-endian
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endif
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ifdef CONFIG_SYS_BIG_ENDIAN
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ARC_CROSS_COMPILE := arceb-buildroot-linux-uclibc-
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PLATFORM_LDFLAGS += -EB
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PLATFORM_CPPFLAGS += -mbig-endian
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endif
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ifeq ($(CROSS_COMPILE),)
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CROSS_COMPILE := $(ARC_CROSS_COMPILE)
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endif
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ifdef CONFIG_ARC_MMU_VER
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CONFIG_MMU = 1
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endif
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ifdef CONFIG_CPU_ARC750D
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PLATFORM_CPPFLAGS += -marc700
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endif
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ifdef CONFIG_CPU_ARC770D
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PLATFORM_CPPFLAGS += -marc700 -mlock -mswape
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endif
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PLATFORM_CPPFLAGS += -ffixed-r25 -D__ARC__ -gdwarf-2
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# Needed for relocation
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LDFLAGS_FINAL += -pie
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# Load address for standalone apps
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CONFIG_STANDALONE_LOAD_ADDR ?= 0x82000000
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# Support generic board on ARC
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__HAVE_ARCH_GENERIC_BOARD := y
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