On Wed, Jun 15, 2022 at 11:25:55AM +0200, Vladimir 'phcoder' Serbinenko wrote: > Documentation states that it works only on some platforms. Currently only on > MIPS. i386-pc always uses lzma > > Le mer. 15 juin 2022, 00:39, Eugene Bright via Grub-devel <grub-devel@gnu.org> > a écrit : > Option --compression doesn't affect the core image size. > Does it work at all? > > Running it without compression `none` > > # grub-mkimage -v -O i386-pc -p /boot btrfs -C none | wc -c > > grub-mkimage: info: the total module size is 0x1a380. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/kernel.img. > > grub-mkimage: info: locating the section .text at 0x0. > > grub-mkimage: info: locating the section .rodata at 0x5d14. > > grub-mkimage: info: locating the section .data at 0x6f40. > > grub-mkimage: info: locating the section .module_license at > 0x77c0. > > grub-mkimage: info: locating the section .bss at 0x77e0. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/crypto.mod. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/gcry_crc.mod. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/gzio.mod. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/diskfilter.mod. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/raid6rec.mod. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/lzopio.mod. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/zstd.mod. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/btrfs.mod. > > grub-mkimage: info: kernel_img=0x7f5fb6bc1010, kernel_size=0x77cf. > > grub-mkimage: info: the core size is 0x10092. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/ > lzma_decompress.img. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/diskboot.img. > > grub-mkimage: info: writing 0x200 bytes. > > grub-mkimage: info: writing 0x10ba2 bytes. > > grub-mkimage: error: cannot sync `stdout': Invalid argument. > > 69026 > > Running it without compression `xz` > > # grub-mkimage -v -O i386-pc -p /boot btrfs -C xz | wc -c > > grub-mkimage: info: the total module size is 0x1a380. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/kernel.img. > > grub-mkimage: info: locating the section .text at 0x0. > > grub-mkimage: info: locating the section .rodata at 0x5d14. > > grub-mkimage: info: locating the section .data at 0x6f40. > > grub-mkimage: info: locating the section .module_license at > 0x77c0. > > grub-mkimage: info: locating the section .bss at 0x77e0. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/crypto.mod. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/gcry_crc.mod. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/gzio.mod. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/diskfilter.mod. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/raid6rec.mod. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/lzopio.mod. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/zstd.mod. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/btrfs.mod. > > grub-mkimage: info: kernel_img=0x7f42a5b1d010, kernel_size=0x77cf. > > grub-mkimage: info: the core size is 0x10092. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/ > lzma_decompress.img. > > grub-mkimage: info: reading /usr/lib/grub/i386-pc/diskboot.img. > > grub-mkimage: info: writing 0x200 bytes. > > grub-mkimage: info: writing 0x10ba2 bytes. > > grub-mkimage: error: cannot sync `stdout': Invalid argument. > > 69026 > > Is it a problem or am I missing something? > > Compression could alleviate `core.img is unusually large. It > won't fit in the embedding area.` issue. > > https://lists.gnu.org/archive/html/grub-devel/2019-11/msg00057.html
I want to add we no longer support small MBR gaps. More you can find here [1]. However, if you use Btrfs then this patch should help [2]. Daniel [1] https://www.gnu.org/software/grub/manual/grub/grub.html#BIOS-installation [2] http://git.savannah.gnu.org/gitweb/?p=grub.git;a=commit;h=b0f06a81c6f31b6fa20be67a96b6683bba8210c9 _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
