On Mon, May 26, 2025 at 04:38:11PM +0200, Michael Tretter wrote: > Adding or modifying nodes in the fdt may change the size of the fdt. > This needs some reserved space in the fdt to avoid overriding memory > that comes after the fdt and is already used. > > Signed-off-by: Michael Tretter <m.tret...@pengutronix.de> > --- > pbl/Kconfig | 11 +++++++++++ > scripts/Makefile.lib | 2 ++ > 2 files changed, 13 insertions(+) > > diff --git a/pbl/Kconfig b/pbl/Kconfig > index > 6e3581829d589c7b06ed878b09bf74e16a0c3086..489b2001a855d62e11a2159311332b0e67f3a754 > 100644 > --- a/pbl/Kconfig > +++ b/pbl/Kconfig > @@ -60,6 +60,17 @@ config PBL_VERIFY_PIGGY > config PBL_CLOCKSOURCE > bool > > +config PBL_FDT_MIN_SIZE > + hex > + default 0x0 > + prompt "Minimum size of the FDT blob" > + help > + The TF-A or OP-TEE may modify the FDT or add nodes to the FDT. This > + may increases the size of the device tree. This may override the > + barebox binary. > + > + The minimum size should be at least CFG_DTB_MAX_SIZE for OP-TEE. > + > config BOARD_GENERIC_DT > bool > select LIBFDT > diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib > index > b10119797686ea31fe927d29a7849ad525c8c835..f50006f57200a76a86c7e29175dd7e35ab138e26 > 100644 > --- a/scripts/Makefile.lib > +++ b/scripts/Makefile.lib > @@ -396,6 +396,8 @@ ifeq ($(CONFIG_OF_OVERLAY_LIVE), y) > DTC_FLAGS.dtb += -@ > endif > > +DTC_FLAGS.dtb += --space $(CONFIG_PBL_FDT_MIN_SIZE)
--space sets the minimum fdt size. The fdt size will vary over time and different boards. Isn't --pad more suitable for what you want to archieve? Sascha -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
