diff options
Diffstat (limited to 'sbin/mdconfig')
| -rw-r--r-- | sbin/mdconfig/mdconfig.8 | 19 | ||||
| -rw-r--r-- | sbin/mdconfig/mdconfig.c | 2 |
2 files changed, 18 insertions, 3 deletions
diff --git a/sbin/mdconfig/mdconfig.8 b/sbin/mdconfig/mdconfig.8 index 824bacc..c7ccba9 100644 --- a/sbin/mdconfig/mdconfig.8 +++ b/sbin/mdconfig/mdconfig.8 @@ -52,6 +52,7 @@ .Fl a .Fl t Ar type .Op Fl o Ar [no]option +.Op Fl b Ar baseaddress .Op Fl s Ar size .Op Fl f Ar file .Op Fl u Ar unit @@ -80,8 +81,8 @@ Storage for this type of memory disk is allocated with .Xr malloc 9 . This limits the size to the malloc bucket limit in the kernel. .It Ar preload -This type represents memory disks which were instantiated by objects loaded -by the bootloader. They can not be created on the fly. +This type represents memory disks which are backed by memory outside the kernels normal address space. +These can be instantiated automatically by objects loaded by the bootloader or configured on the fly. .It Ar vnode A file specified with .Fl f Ar file @@ -89,6 +90,8 @@ becomes the backingstore for this memory disk. .It Ar swap swapspace is used to back this memory disk. .El +.It Fl b Ar baseaddress +Starting address in kernel virtual space of the memory to be used for a ``preload'' type disk. .It Fl f Ar file Filename to use for the vnode type memory disk. .It Fl s Ar size @@ -108,7 +111,13 @@ Automatically allocate the next free unit number for this disk. The basename of the disk is printed on stdout. .It Ar [no]compress Enable/Disable compression features to reduce memory usage. +.It Ar [no]readonly +Enable/Disable readonly mode. .El +.It Fl u Ar unit +Force the +.Xr md(4) +device to use a specific unit number. .El .Sh EXAMPLES .Pp @@ -138,6 +147,12 @@ To create and mount a 128MByte swap backed filesystem on .Dl newfs -f 4096 /dev/md10c .Dl tunefs -n enable /dev/md10c .Dl mount /dev/md10c /tmp +.Pp +It is practically impossible to give a universal example of the ``preload'' type of disk, +it is mainly useful in the embedded systems market, but to give a feel for how it works: +On most standard PC architecture machines this will create a disk backed by the BIOS ROM: +.Pp +.Dl mdconfig -a -t preload -s 128k -b 0xc00fe000 .Sh SEE ALSO .Xr md 4 , .Xr disklabel 8 , diff --git a/sbin/mdconfig/mdconfig.c b/sbin/mdconfig/mdconfig.c index dca1b40..9f43877 100644 --- a/sbin/mdconfig/mdconfig.c +++ b/sbin/mdconfig/mdconfig.c @@ -44,7 +44,7 @@ main(int argc, char **argv) int cmdline = 0; for (;;) { - ch = getopt(argc, argv, "adf:o:s:t:u:"); + ch = getopt(argc, argv, "ab:df:o:s:t:u:"); if (ch == -1) break; switch (ch) { |
