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Using Grub2 with Multiboot2 http://forums.osdever.net/viewtopic.php?f=5&t=407 |
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Author: | hektec [ Wed Sep 01, 2010 4:24 pm ] |
Post subject: | Using Grub2 with Multiboot2 |
Ok, so i've been tinkering with some assembly language and have successfully booted using grub2 with Multiboot and Multiboot2 specs; however, I have no clue if I am using MULTIBOOT_VIDEO_MODE flag correctly ... or the framebuffer tag for that matter. Supposedly the Multiboot2 header for an elf32 supports setting the video mode: Code: struct multiboot_header { /* Must be MULTIBOOT_MAGIC - see above. */ multiboot_uint32_t magic; /* Feature flags. */ multiboot_uint32_t flags; /* The above fields plus this one must equal 0 mod 2^32. */ multiboot_uint32_t checksum; /* These are only valid if MULTIBOOT_VIDEO_MODE is set. */ multiboot_uint32_t mode_type; multiboot_uint32_t width; multiboot_uint32_t height; multiboot_uint32_t depth; }; Here is my Multiboot2 header Code: .set MB_FLAGS, MULTIBOOT_VIDEO_MODE .align 8 /* Align 64 bits boundary. */ multiboot_header: /* Multiboot header. */ .long MULTIBOOT2_HEADER_MAGIC /* magic */ .long MB_FLAGS .long -( MULTIBOOT2_HEADER_MAGIC + MB_FLAGS ) address_tag_end: framebuffer_tag_start: .long 1 .long 1024 .long 768 .long 16 framebuffer_tag_end: .long 0 // To make it even multiboot_header_end: I didn't see any resulting video changes tho .... ... no surprises there .... |
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