diff options
Diffstat (limited to 'doc/chain.txt')
| -rw-r--r-- | doc/chain.txt | 41 |
1 files changed, 27 insertions, 14 deletions
diff --git a/doc/chain.txt b/doc/chain.txt index 6dd0632d..2321c102 100644 --- a/doc/chain.txt +++ b/doc/chain.txt @@ -53,29 +53,27 @@ Module invocation: chain [drive/partition] [options] +In case of repeated arguments, rightmost ones take precedence. + + DRIVE / PARTITION SPECIFICATION Drive can be specified as 'hd#', 'fd#', 'boot', 'mbr', or 'guid'. -- 'mbr' will select a drive by a signature. -- 'guid' will select a drive by a guid +- 'mbr' will select a drive by its signature. +- 'guid' will select a drive by its guid (GPT only). - 'boot' is the drive syslinux was booted from. This is the default value, if nothing else is specified. - 'hd#' and 'fd#' are standard ways to specify drive number as seen by bios, starting from 0. -Option 'guid' is shared with partition selection (see below). If you happened +Option 'guid' is shared with partition selection (see below). If you happen to have non-unique guids, they are searched in disk0, partitions of disk0, disk1 ... order. -The priority of those options are the same as in the above list. - -If you specify the same value more than once, the last value will be used. - 'mbr' and 'guid' take extra parameter - you should use ':' or '=' as a delimiter. - Partition can be specified as '#', 'guid', 'label' or 'fs'. - 'guid' option will select a partition by a guid (not a type guid !) @@ -85,11 +83,10 @@ Partition can be specified as '#', 'guid', 'label' or 'fs'. - '#' is the standard method. Partitions 1-4 are primary, 5+ logical, 0 = boot MBR (default). -The priority of those options are the same as in the above list. - If you use a number to select a partition it should be specified after a drive using space or comma as delimiters (after 'hd#', 'fd#', 'mbr', 'guid' or 'boot'). + OPTIONS file=<file> *nofile @@ -110,11 +107,11 @@ This triplet lets you alter the addresses a file will use. It's loaded at other bootloader or kernel, it's almost always mandatory. The defaults, if option is not specified, are 0:0x7c00:0x7c00 -If any of the fields are ommited (e.g. 0x2000::), they default to 0. +If any of the fields are omitted (e.g. 0x2000::), they default to 0. sect=<segment>:<offset>:<ip> - nosect *sect=0:0x7c00:0x7c00 + nosect nosect sets: nomaps This triplet lets you alter the addresses a sector will use. It's loaded at @@ -126,7 +123,7 @@ expect relocated sector at some particular address (e.g. DRKM). is being chainloaded, sector is not necessary. The defaults if option is not specified, are 0:0x7c00:0x7c00. -If some of the fields are ommited (e.g. 0x2000::), they default to 0. +If some of the fields are omitted (e.g. 0x2000::), they default to 0. *maps nomaps @@ -229,8 +226,24 @@ stacks in memory (pxelinux only). This option will wait for a keypress right before continuing the chainloading. Useful to see warnings emited by the chain module. - *nobreak + prefmbr + *noprefmbr + +In the case of presence of non-standard hybrid MBR/GPT layout, this flag makes +chain module prefer MBR layout over GPT. + + relax + *norelax + +This option inhibits sanity checks during the traversal of the partition table. +This is potentially useful in corner cases, when for example an usb stick moved +to some different computer would report smaller size than previously with +partitions spanning the whole space. Normally partition iterator would report +an error and abort in such case. Another case scenario is disk corruption in +some later EMBR partition. + break + *nobreak break sets: nofile nomaps nohand It is possible to trigger a "service-only" run - The chain module will do |