Hello Marco, On 11/10/25 9:34 PM, Marco Felsch wrote: > OP-TEE has the support to write DTB overlay fragments if enabled via > OP-TEE config switch CFG_EXTERNAL_DTB_OVERLAY. > > The overlay fragments are added to the exisiting DTB if OP-TEE was > started with a DTB provided via arg2 or written to a stand-alone DTB > overlay. > > This adds a dedicated storage slot which can be passed to OP-TEE or be > used by barebox to extract the added overlay fragment into it. > > Signed-off-by: Marco Felsch <[email protected]> > ---
> +config SCRATCH_FDTO_SIZE > + hex > + default 0x0 > + default 0x4000 if PBL_EARLY_FDT_LOAD > + prompt "Scratch FDTO size" > + help > + The size of possible FDT overlay areas used by BL3x binaries to store > + runtime generated overlays. Can be 0x0 if early FDT support is not > + requied e.g. during BL31 and BL32 stage. I understand the need, but I dislike that we add such fine-grained Kconfig symbols here. With Sascha's series to make barebox proper an ELF, PBL will have more insight about how much space barebox proper occupies and I intend to send a series after it to allow easier allocation for hand-off data. I will include provisions for passing around the device tree and an overlay with that series, so please hold off sending your v2 until then. Thanks, Ahmad > + > config MALLOC_ALIGNMENT > hex > default 8 > diff --git a/include/mach/imx/scratch.h b/include/mach/imx/scratch.h > index > 43bf55de48099f1662cd4331620a93303d4dd710..a9745a95732dd961dcae83ec46c3eaa078d62a16 > 100644 > --- a/include/mach/imx/scratch.h > +++ b/include/mach/imx/scratch.h > @@ -15,6 +15,7 @@ const struct optee_header *imx_scratch_get_optee_hdr(void); > void imx_scratch_save_optee_hdr(const struct optee_header *hdr); > > void imx_scratch_get_fdt(void **fdt, unsigned int *fdt_sz); > +void imx_scratch_get_optee_fdto(void **fdto, unsigned int *fdto_sz); > > #define imx8mq_init_scratch_space() imx8m_init_scratch_space(32, true) > #define imx8mm_init_scratch_space() imx8m_init_scratch_space(32, true) > -- 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 |
