On Friday 23 April 2021 10:25:21 Bin Meng wrote: > Hi Pali, > > On Fri, Apr 23, 2021 at 12:10 AM Pali Rohár <[email protected]> wrote: > > > > BIOS Release Date must be in format mm/dd/yyyy and must be release date. > > U-Boot currently sets BIOS Release Date from U_BOOT_DMI_DATE macro which is > > generated from current build timestamp. > > > > Fix this issue by setting U_BOOT_DMI_DATE macro to U-Boot version which is > > better approximation of U-Boot release date than current build timestamp. > > Current U-Boot versioning is in format yyyy.mm so as a day choose 01. > > > > Some operating systems are using BIOS Release Date for detecting when was > > SMBIOS table filled or if it could support some feature (e.g. BIOS from > > 1990 cannot support features invented in 2000). So this change also ensures > > that recompiling U-Boot from same sources but in different year does not > > change behavior of some operating systems. > > > > Macro U_BOOT_DMI_DATE is not used in other file than lib/smbios.c > > so remove it from global autogenerated files and also from Makefile. > > > > Signed-off-by: Pali Rohár <[email protected]> > > --- > > Makefile | 2 -- > > doc/develop/version.rst | 1 - > > lib/smbios.c | 23 +++++++++++++++++++++++ > > 3 files changed, 23 insertions(+), 3 deletions(-) > > > > With this change the U-Boot date is only the release date, so one > cannot tell exact BIOS date on which U-Boot was built from.
Hello Bin! I understood that this is expected and it should be the release date, not the build date. But maybe it has different meanings in different contexts?
