Add NO_BOOT variable

[novaboot.git] / novaboot

diff --git a/novaboot b/novaboot
index 9b2c3df2930414e52194c3069c077d6a4a868958..d0d097d9fb05294d5a157de2ed9a698ffd5e02e4 100755 (executable)
--- a/novaboot
+++ b/novaboot
@@ -1016,7 +1016,7 @@ if (defined $uboot) {
     }
 
     # Boot the system if there are some load lines in the script
-    if (scalar(@$modules) > 0) {
+    if (scalar(@$modules) > 0 && !$variables->{NO_BOOT}) {
        my ($kbin, $kcmd) = split(' ', shift(@$modules), 2);
        my $dtb;
        @$modules = map { if (/\.dtb$/) { $dtb=$_; (); } else { $_ } } @$modules;
@@ -1761,6 +1761,13 @@ contain the name of the kernel image as well as its command line
 parameters. If this variable is defined and non-empty, the variable
 HYPERVISOR_PARAMS is not used.
 
+=item NO_BOOT
+
+If this variable is 1, the system is not booted. This is currently
+only implemented for U-Boot bootloader where it is useful for
+interacting with the bootloader without booting the system - e.g. for
+flashing.
+
 =item QEMU
 
 Use a specific qemu binary (can be overridden with B<-Q>) and flags