Skip to content
Permalink
Browse files
[build] Generate random build identifier
Randomly generate a 32-bit build identifier that can be used to
identify identical iPXE ROMs when multiple such ROMs are present in a
system (e.g. when a multi-function NIC exposes the same iPXE ROM image
via each function's expansion ROM BAR).

Signed-off-by: Michael Brown <mcb30@ipxe.org>
  • Loading branch information
mcb30 committed Apr 25, 2010
1 parent 483c3c0 commit 58f6e553625c90d928ddd54b8f31634a5b26f05e
Showing 2 changed files with 10 additions and 2 deletions.
@@ -686,13 +686,18 @@ $(BLIB) : $(BLIB_OBJS) $(BLIB_LIST) $(MAKEDEPS)
$(Q)$(RANLIB) $@
blib : $(BLIB)

# Command to generate build ID. Must be unique for each $(BIN)/%.tmp,
# even within the same build run.
#
BUILD_ID_CMD := perl -e 'printf "0x%08x", int ( rand ( 0xffffffff ) );'

# Build an intermediate object file from the objects required for the
# specified target.
#
$(BIN)/%.tmp : $(BLIB) $(MAKEDEPS) $(LDSCRIPT)
$(BIN)/%.tmp : $(BLIB) $(MAKEDEPS) $(LDSCRIPT)
$(QM)$(ECHO) " [LD] $@"
$(Q)$(LD) $(LDFLAGS) -T $(LDSCRIPT) $(TGT_LD_FLAGS) $(BLIB) -o $@ \
-Map $(BIN)/$*.tmp.map
--defsym _build_id=`$(BUILD_ID_CMD)` -Map $(BIN)/$*.tmp.map
$(Q)$(OBJDUMP) -ht $@ | $(SORTOBJDUMP) >> $(BIN)/$*.tmp.map

# Keep intermediate object file (useful for debugging)
@@ -52,6 +52,9 @@ checksum:
.long 0
.previous

build_id:
.long _build_id /* Randomly-generated build ID */

pciheader:
.ascii "PCIR" /* Signature */
.word pci_vendor_id /* Vendor identification */

0 comments on commit 58f6e55

Please sign in to comment.