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-rw-r--r--docs/misc/efi.markdown7
1 files changed, 7 insertions, 0 deletions
diff --git a/docs/misc/efi.markdown b/docs/misc/efi.markdown
index d697bc23c8..19b987a848 100644
--- a/docs/misc/efi.markdown
+++ b/docs/misc/efi.markdown
@@ -75,6 +75,13 @@ Specifies an XSM module to load.
Specifies a CPU microcode blob to load.
+###`chain=<filename>`
+
+Specifies an alternate configuration file to use in case the specified section
+(and in particular its `kernel=` setting) can't be found in the default (or
+specified) configuration file. This is only meaningful in the [global] section
+and really not meant to be used together with the `-cfg=` command line option.
+
Filenames must be specified relative to the location of the EFI binary.
Extra options to be passed to Xen can also be specified on the command line,