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microwatt: Fix relocation error when linking 

When building with GCC 11:

../libbase/crt0.o: in function `_start':
litex/soc/cores/cpu/microwatt/crt0.S:54:(.text+0x38): relocation truncated to fit: R_PPC64_GOT16_DS against symbol `_fdata' defined in .data section in bios.elf
litex/soc/cores/cpu/microwatt/crt0.S:55:(.text+0x3c): relocation truncated to fit: R_PPC64_GOT16_DS against symbol `_edata' defined in .data section in bios.elf
litex/soc/cores/cpu/microwatt/crt0.S:56:(.text+0x40): relocation truncated to fit: R_PPC64_GOT16_DS against symbol `_fdata_rom' defined in *ABS* section in bios.elf
litex/soc/cores/cpu/microwatt/crt0.S:68:(.text+0x68): relocation truncated to fit: R_PPC64_GOT16_DS against symbol `_fbss' defined in .bss section in bios.elf
litex/soc/cores/cpu/microwatt/crt0.S:69:(.text+0x6c): relocation truncated to fit: R_PPC64_GOT16_DS against symbol `_ebss' defined in .bss section in bios.elf
litex/soc/cores/cpu/microwatt/crt0.S:80:(.text+0x90): relocation truncated to fit: R_PPC64_GOT16_DS against symbol `_fstack' defined in .bss section in bios.elf
boot.o: in function `copy_file_from_sdcard_to_ram':
litex/soc/software/bios/boot.c:622:(.text+0x18): relocation truncated to fit: R_PPC64_TOC16_DS against `.toc'
litex/soc/software/bios/boot.c:627:(.text+0x5c): relocation truncated to fit: R_PPC64_TOC16_DS against `.toc'+8
litex/soc/software/bios/boot.c:633:(.text+0x8c): relocation truncated to fit: R_PPC64_TOC16_DS against `.toc'+10
litex/soc/software/bios/boot.c:639:(.text+0xdc): relocation truncated to fit: R_PPC64_TOC16_DS against `.toc'+18
litex/soc/software/bios/boot.c:650:(.text+0x128): additional relocation overflows omitted from the output

This is because we pass -mcmodel=small. As the PowerPC ELF ABI
describes, the small code model restricts the relocations to 16-bit
offsets[1]. If we omit the option we get the default, which is the
medium model allowing 32-bit offsets.

http://openpowerfoundation.org/wp-content/uploads/resources/leabi/content/dbdoclet.50655240_19143.html

Signed-off-by: Joel Stanley <joel@jms.id.au>
This commit is contained in:
Joel Stanley 2021-09-01 15:43:56 +09:30
parent d91c8dcfa2
commit 722772a3d8
1 changed files with 0 additions and 1 deletions
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litex/soc/cores/cpu/microwatt/core.py
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@ -58,7 +58,6 @@ class Microwatt(CPU):
flags += "-mlittle-endian "
flags += "-mstrict-align "
flags += "-fno-stack-protector "
flags += "-mcmodel=small "
flags += "-D__microwatt__ "
return flags