On Fri, May 30, 2008 at 2:17 AM, Robert Millan <[EMAIL PROTECTED]> wrote: > On Fri, May 30, 2008 at 12:50:42AM +0800, Bean wrote: >> >> BTW, I think we can embed the UUID of the root device in >> core.img/grub.elf, so that when the traditional root device fails to >> locate normal.mod, it uses the UUID to scan for root device. > > Good idea. But I'd check for UUID first. When you find a UUID match, it's > much more reliable than a filename one.
Here are some thought about how to store it. We can reuse the space occupied by prefix. Instead of one variable, we use zero-end strings like: path=/boot/grub \0 uuid=xxx-xxx-xxxx \0 \0 We can also add other variable, for example, debug and default. debug is useful as it can show message before grub.cfg is loaded, and default is used to control the default menu entry. Other variable should be set in grub.cfg, as space is quite limited here. path=/boot/grub \0 uuid=xxx-xxx-xxxx \0 debug=all \0 default=1 \0 \0 The space need to expand slightly, I guess something about 100 byte is more than enough. The whole block is prefixed by a magic number and block length, so that it's easy to locate by utility. This also solve the savedefault issue, we can add a command like this: save_env /path_to_core.img variable_name .. It finds the magic number, and store the value of selected variable in the embedded environment block. -- Bean _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org http://lists.gnu.org/mailman/listinfo/grub-devel
