Hi, xorriso-wise, the debian-10.0-sparc64-grub-NETINST-1.iso looks ok:
$ xorriso -indev debian-10.0-sparc64-grub-NETINST-1.iso \ -report_system_area plain ... Volume id : 'Debian 10.0 sparc64 n' System area options: 0x0000000c System area summary: SUN-SPARC-Disk-Label ISO image size/512 : 443640 SUN SPARC disklabel: CD-ROM Disc with Sun sparc boot created by libisofs SUN SPARC secs/head: 640 SUN SPARC heads/cyl: 1 SUN SPARC partmap : N IdTag Perms StartCyl NumBlocks SUN SPARC partition: 1 0x0004 0x0010 0 443640 SUN SPARC partition: 2 0x0002 0x0010 0 443640 SUN SPARC partition: 3 0x0002 0x0010 0 443640 SUN SPARC partition: 4 0x0002 0x0010 0 443640 SUN SPARC partition: 5 0x0002 0x0010 0 443640 SUN SPARC partition: 6 0x0002 0x0010 0 443640 SUN SPARC partition: 7 0x0002 0x0010 0 443640 SUN SPARC partition: 8 0x0002 0x0010 0 443640 SPARC GRUB2 core : 1748992 453104 SPARC GRUB2 path : /boot/core.img xorriso reports /boot/core.img as "SPARC GRUB2 path", because it was recognized as comming from the same disk inode as /boot/grub/core.img and thus shares the content blocks with it: $ xorriso -indev debian-10.0-sparc64-grub-NETINST-1.iso \ -find /boot/core.img -exec report_lba -- \ -find /boot/grub/core.img -exec report_lba -- ... Report layout: xt , Startlba , Blocks , Filesize , ISO image path File data lba: 0 , 854 , 222 , 453104 , '/boot/core.img' Report layout: xt , Startlba , Blocks , Filesize , ISO image path File data lba: 0 , 854 , 222 , 453104 , '/boot/grub/core.img' So all is well. Except the nearly zero content of bytes 512 to 767 of the ISO. Have a nice day :) Thomas