Hi Thomas, On Mon, May 30, 2022 at 9:01 AM Thomas Schaefer <thomas.schae...@kontron.com> wrote: > > Hi all, > > We are trying to boot our i.MX8MNano UltraLite DDR3L EVK via USB using Serial > Download Mode. We are using u-boot v2022.04-rc3 with patches to support DDR3L > memory on this eval system.
Do you mean 2022.04-rc3 or 2022.07-rc3? 2022.07-rc3 has the following commit that allows booting imx8mn evk ddr4/lpdd4 via USB download mode: https://source.denx.de/u-boot/u-boot/-/commit/d175982c207bb2ace592d7985cd3f05ab99759d9 > ATF firmware used is built using imx_5.4.47_2.2.0 branch of imx-atf firmware. I am using the NXP lf_v2.4 branch instead. > In addition we are using ddr3_[di]mem_1d_201810.bin DDR training images from > firmware-imx-8.10 package. > > When copying the resulting flash.bin image on SD card or eMMC, the board is > booting fine to linux prompt. But when trying to boot that same image via USB > when the board is in Serial Download Mode, the board hangs up when ATF > firmware (bl31.bin) has finished (I have added some debug prints to BL31 to > verify this). > > Are the DDR4/LPDDR4 variants of the i.MX8MNano eval kit known to boot in > serial download mode? Yes, I confirm these variants boot fine via "uuu flash.bin". Regards, Fabio Estevam
