Hi Fabio, >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? Actually I'm working on v2022.04-rc3 right now. We are waiting for Heiko's patch series for i.MX8MN DDR3L EVK support (https://patchwork.ozlabs.org/project/uboot/patch/20220415183558.149447-1-heiko.thi...@gmail.com/) to be merged into mainline. > >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 > But anyway, the patch above is the missing piece, now the DDR3L EVK boots fine over USB. >> 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. We are using NXP imx_5.4.47_2.2.0 branch because it is documented this way in the board docs. Is there a reason why you prefer lf_v2.4 ? > >> 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 Thanks a lot for your help, Thomas
