By making the kernel argv array const, the .data section can always be
omitted from the laoder binary.
Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
The text section in the ELF loader is aligned to the maximum page size,
which defaults to 64KB. Reduce it to the actual page size to avoid wasting
flash space for this alignment.
Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
Some devices (TP-Link TL-WR1043ND v1) don't boot reliably when the
uncompressed loader is too small. This was workarounded in the loader by
adding 512KB of padding to the .data section of the loader binary.
This approach had two issues:
- The padding was only working when .data was non-empty (otherwise the
section would become NOBITS, omitting it in the binary). .data was only
empty when no CMDLINE was set, leading to further workarounds like
fe594bf90d ("ath79: fix loader-okli, lzma-loader"), and this
workaround was only effective because a missing "const" led to the kernel
argv being stored in .data instead of .rodata
- The padding was not only added to the compressed .gz loader, but also
uncompressed .bin and .elf loaders. The prevented embedding the kernel
cmdline in the loader for non-gz loader types.
To fix both issues, move the creation of the padding from the linker script
to the gzip step.
Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
For an unknown reason gcc tries to link in crti.o when building with a
glibc toolchain (this does not happen with other targets). Prevent this
by telling gcc explicitly to not do that.
Fixes the following build error:
/home/jonas/git/lede/staging_dir/toolchain-mips_24kc_gcc-5.5.0_glibc/lib/gcc/mips-openwrt-linux-gnu/5.5.0/../../../../mips-openwrt-linux-gnu/lib/crti.o: In function `_init':
(.init+0x18): relocation truncated to fit: R_MIPS_GOT16 against `__gmon_start__'
/home/jonas/git/lede/staging_dir/toolchain-mips_24kc_gcc-5.5.0_glibc/lib/gcc/mips-openwrt-linux-gnu/5.5.0/../../../../mips-openwrt-linux-gnu/lib/crti.o: In function `_init':
(.init+0x28): relocation truncated to fit: R_MIPS_CALL16 against `__gmon_start__'
collect2: error: ld returned 1 exit status
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Change the Makefile to use LTO for better code optimisations. Gains are
very low, only 270 bytes saved, but it's only Makefile changes.
Signed-off-by: Julien Dusser <julien.dusser@free.fr>
Some bootloaders set a cache cohenrency to a very slow mode. Use code from
Linux kernel to set it to "Cacheable, noncoherent, write-back, write
allocate".
Perfomance impact is significant on TP-Link EAP245 board, kernel
decompression time fall from 33 seconds to less than 1.
Signed-off-by: Julien Dusser <julien.dusser@free.fr>
According to the calling convention of the o32 ABI the caller
function must reserve stack space for $a0-$a3 registers in case
the callee needs to save its arguments.
The assembly code of the loader does not reserve stack space for
these registers thus when the 'loader_main' function needs to save
its arguments, those will be stored in the 'workspace' area instead
of the stack.
Because the workspace area is also used by other part of the code, the
saved register values gets overwritten and this often leads to failed
kernel boots.
Fix the code to reserve stack space for the registers to avoid this
error.
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
SVN-Revision: 48279
To make the lzma-loader build with binutils 2.25.1 it is needed to
remove the .MIPS.abiflags section otherwise I get the following compile
error:
mips-openwrt-linux-musl-objcopy -O binary -R .reginfo -R .note -R .comment -R .mdebug -S loader loader.bin
mips-openwrt-linux-musl-objcopy: Warning: Writing section `.text' to huge (ie negative) file offset 0xffffffff80a00000.
mips-openwrt-linux-musl-objcopy:loader.bin[.text]: File truncated
This should close#20487.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
SVN-Revision: 46893
The generic kernel cmdline parser ignores argv[0], this caused a
regression for all lzma-loader based boards with linux 4.1
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
SVN-Revision: 46544
Matthias Schiffer