Hi Francesco, On Wed, Mar 11, 2026 at 10:14:19AM +0100, Francesco Dolcini wrote: > On Tue, Mar 10, 2026 at 05:27:45PM +0200, Simona Toaca wrote: > > On Tue, Mar 10, 2026 at 04:04:19PM +0100, Emanuele Ghidoli wrote: > > > On 3/10/26 12:54, Simona Toaca (OSS) wrote: > > > > From: Simona Toaca <[email protected]> > > > > > > > > Call qb save automatically in the board-specific > > > > spl_board_init(), if SPL_QB option is enabled. This > > > > makes sure qb_save is called before any image loading > > > > is done by the SPL. > > > > > > > > Signed-off-by: Simona Toaca <[email protected]> > > ... > > > > > diff --git a/board/nxp/imx94_evk/spl.c b/board/nxp/imx94_evk/spl.c > > > > index cc5b7f9ef0f..1d25795eb17 100644 > > > > --- a/board/nxp/imx94_evk/spl.c > > > > +++ b/board/nxp/imx94_evk/spl.c > > > > @@ -44,6 +45,9 @@ void spl_board_init(void) > > > > ret = ele_start_rng(); > > > > if (ret) > > > > printf("Fail to start RNG: %d\n", ret); > > > > + > > > > + if (IS_ENABLED(CONFIG_SPL_IMX_QB)) > > > > + spl_qb_save(); > > > Does it write to MMC/NOR/SD at every boot? Is that necessary if a quick > > > boot > > > was performed and the data has not changed? > > > > } > > No, the qb() method calls qb_check, which returns true only if OEI > > saved valid data to volatile memory (meaning it has run Training flow). > > So, if Quickboot flow is run, the data in volatile memory is not valid, > > qb_check fails -> qb returns and does not write anything to the NVM. > > > > Also, another thing to keep in mind is that after a successfull > > qb save, the data in volatile memory is invalidated -> qb check will > > fail as well even if OEI doesn't run (so on a warm reboot). > > Do you think that this is something that should be generally enabled on > any i.MX95 boards? Emanuele? > > Francesco >
I think it depends on the usecase. Enabling QB in SPL is useful for: - automating the save - being able to skip U-Boot proper Enabling CMD_IMX_QB: - lets the user save the data during flashing - lets the user save the data to a different boot device. If SPL QB is enabled, the qb save command is only useful in the uuu script. I will add these comments to the documentation as well. Another thing is that if SPL_IMX_QB is enabled, other config options also have to be enabled depending on the boot device (for example, as I have also written in the documentation, SPL_MMC_WRITE for MMC boot devices). I should mention that this functionality is tested on latest iMX95 rev: B0 (if talking about 95) and has to be in sync with OEI. Best regards, Simona
