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SubjectFail to build tftpboot.img
Hello

For reinstalling an old SPARC machine , I need a netboot image.
I tried to create it via make tftpboot.img but got:
BUILD: sparc to /home/compile/crossbuild/next/sparc/sparc64/defconfig
make[1]: Entering directory '/usr/src/crossbuild/next/sparc/sparc64/defconfig'
GEN Makefile
scripts/kconfig/conf --syncconfig Kconfig
GEN Makefile
CALL /linux-next/scripts/atomic/check-atomics.sh
CALL /linux-next/scripts/checksyscalls.sh
<stdin>:1511:2: warning: #warning syscall clone3 not implemented [-Wcpp]
CHK include/generated/compile.h
GZIP kernel/config_data.gz
CC kernel/configs.o
AR kernel/built-in.a
GEN .version
CHK include/generated/compile.h
UPD include/generated/compile.h
CC init/version.o
AR init/built-in.a
LD vmlinux.o
MODPOST vmlinux.symvers
WARNING: modpost: EXPORT symbol "_mcount" [vmlinux] version generation failed, symbol will not be versioned.
MODINFO modules.builtin.modinfo
GEN modules.builtin
LD .tmp_vmlinux.kallsyms1
KSYM .tmp_vmlinux.kallsyms1.o
LD .tmp_vmlinux.kallsyms2
KSYM .tmp_vmlinux.kallsyms2.o
LD vmlinux
SYSMAP System.map
MODPOST Module.symvers
STRIP arch/sparc/boot/image
kernel: arch/sparc/boot/image is ready
ELFTOAOUT arch/sparc/boot/tftpboot.img
PT 0 Entry: Loadable to 0x400000[0x5288d0] from 0x0[0x4ca694] align 0x100000
PT 1 Entry: Note
PT 2 Entry: unknown
PIGGY arch/sparc/boot/tftpboot.img
lseek: Invalid argument
make[2]: *** [/linux-next/arch/sparc/boot/Makefile:72: arch/sparc/boot/tftpboot.img] Error 1
make[2]: *** Deleting file 'arch/sparc/boot/tftpboot.img'
make[1]: *** [arch/sparc/Makefile:76: tftpboot.img] Error 2
make[1]: Leaving directory '/usr/src/crossbuild/next/sparc/sparc64/defconfig'
make: *** [Makefile:185: __sub-make] Error 2

I got this result on both linux-next and 5.6.15

I have straced the process:
22495 openat(AT_FDCWD, "arch/sparc/boot/tftpboot.img", O_RDWR) = 3
22495 read(3, "\1\3\1\7\0\0\0\0\0Lf\224\0\0\0\0\0\0\0\0\0\0\0\0\0\5\342<\0\0\0\0"..., 512) = 512
22495 lseek(3, 0, SEEK_SET) = 0
22495 read(3, "\1\3\1\7\0\0\0\0\0Lf\224\0\0\0\0\0\0\0\0\0\0\0\0\0\5\342<\0\0\0\0"..., 1024) = 1024
22495 lseek(3, -480, SEEK_SET) = -1 EINVAL (Argument invalide)
22495 dup(2) = 4
22495 fcntl(4, F_GETFL) = 0x402 (flags O_RDWR|O_APPEND)
22495 fstat(4, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x1a), ...}) = 0
22495 write(4, "lseek: Invalid argument\n", 24) = 24
22495 close(4) = 0

Regards

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