iPXE discussion forum

hello all

good to know that latest wimboot (2.2.4) support UEFI booting.

but it seems that boot.wim filename max length is restricted to 7 ?

e.g.
if loaded with filename initrd 1234567.wim it's OK
if loaded with filename initrd 12345678.wim then boot failed


P.S. are these all same effect:
initrd boot/bcd bcd
initrd boot/bcd
initrd --name bcd boot/bcd
initrd -n bcd boot/bcd

ok , just found that maybe there're two types of name syntax.

1 , when booting in normal BIOS: initrd oldFilename newFilename
newFilename can be same as oldFilename, but must exist, not optional.

2 , when booting under UEFI : initrd --name newFilename oldFilename
newFilename is optional. can be shorted as： initrd oldFilename

(2014-09-11 03:32)cckp Wrote: [ -> ]but it seems that boot.wim filename max length is restricted to 7 ?

e.g.
if loaded with filename initrd 1234567.wim it's OK
if loaded with filename initrd 12345678.wim then boot failed

There shouldn't be any 7-character limit. wimboot supports long file names (which is required for some of the other boot-related files, e.g. font files).

Quote:P.S. are these all same effect:
initrd boot/bcd bcd
initrd boot/bcd
initrd --name bcd boot/bcd
initrd -n bcd boot/bcd

No. As a general rule, use


i.e. ensure that the basename of the URL matches the filename you provide as the argument to "initrd". If you can't do this, then you can use


i.e. forcibly override the filename as seen by iPXE using the -n/--name option.

Michael

Quote:
There shouldn't be any 7-character limit. wimboot supports long file names

sure , it does support long file names

but my point is , the boot.wim file name, not font name

tried many times , modified bcd using bcdedit, set it to point to diffent length boot.wim flenames

I found that the filename length of the .wim file
can be shorter than 8, like 4,5,6,7 ,
and can be longer than 8, like 9, 10 , 11,
but , can NOT be 8.

e.g. in bcd you can set it to point to
\sources\boot.wim (default , length is 4)
\sources\boot5.wim ( length is 5)
\sources\boot56.wim ( length is 6)
\sources\boot567.wim ( length is 7)
-
\sources\boot56789.wim ( length is 9)
\sources\boot567890.wim ( length is 10)

all boot ok with wimboot 2.2.4（uefi and bios）

but you can NOT set .wim name in BCD like this:
\sources\boot5678.wim ( length is 8)

but older version wimboot can boot with .wim filename length 8
and MS can boot directly from PXE using bootx64.efi with .wim filename length 8


this is not a problem , since almost all the time the length is 4, like "boot.wim", and there's option for 5 6 7 9 10 ...

but why can not be 8? interesting

(2014-09-21 15:39)cckp Wrote: [ -> ]I found that the filename length of the .wim file
can be shorter than 8, like 4,5,6,7 ,
and can be longer than 8, like 9, 10 , 11,
but , can NOT be 8.

Good catch. I have found the bug in the wimboot code, which affects all filenames of exactly 12 characters. Could you let me know your name and e-mail address (for the commit log message)?

Quote:but older version wimboot can boot with .wim filename length 8

This is unlikely; the code in question has been present since the first released version of wimboot (v0.9).

Michael

Sorry for the older version part.
If I tried some more tests, I may found the 12 character limitation by myself...
Anyway it's good to know that it help you to find out the real thing. feel honored , just reference me as a forum member.

(2014-09-23 03:43)cckp Wrote: [ -> ]Sorry for the older version part.
If I tried some more tests, I may found the 12 character limitation by myself...
Anyway it's good to know that it help you to find out the real thing. feel honored , just reference me as a forum member.

Done; released as v2.2.5. Thanks for the bug report!

Michael