Hello everyone ! I've started working on porting uboot from a custom version on 2017.03 to 2022.04, for a board based on NXP i.MX6D/Q. My build system is Yocto kirkstone. I've managed to get SPL running, and configured the RAM following the .cfg file that was present before:
... /* DDR IO TYPE */ DATA 4 0x020e0798 0x000C0000 // IOMUXC_SW_PAD_CTL_GRP_DDR_TYPE DATA 4 0x020e0758 0x00000000 ...
Then, I've got the SPL loading U-boot proper in DRAM at address 0x1780_0000 (as I've seen done in other i.MX6 boards). Problem is... nothing happens after "Jumping to U-boot" and "image entry point: 0x17800000". I've not been able to get any debug from U-boot proper :-/
What I've done so far for the debug: Added a lot of debug messages (had a little trouble with the MMC init). I've hexdump'ed my u-boot.img file, both head and tail, and checked the corresponding registers at addresses 0x177f_ffc0 and 0x1782_65d0. They do correspond. Enabled the DEBUG_UART config. Added a method with puts(...) as the first thing to run in the initialization list of common/board_f.c Tried to reduce my U-boot proper board .c file to a minimum. Added a debug message after the image_entry() call from jump_to_image_no_args(...) => I do not see that message.
Has anyone encountered this situation ? It looks to me as if the jump point does not contain an instruction, could this possible ?
Attaching the SPL log that I'm able to get.
Thanks for any help ! Damien KIRK
U-Boot SPL 2022.04+fslc+gf885198273 (Apr 05 2022 - 14:46:25 +0000) SPL: End of magia-codex-spl board_init (libcommon)
SPL: board_init_r()
using memory lx-lx for malloc() spl_init Trying to boot from MMC1 fsl_esdhc_initialize ... ... hdr read sector 8a, count=1 SPL: payload image: U-Boot 2022.04+fslc+gf885198273 � load addr: 0x177fffc0 size: 157220 i_o_s = 0, spl_i->o = 0, mmc->r_bl_l = 200 i_offset = 0 iss = 134, splis = 26624, mmcrbll = 200 read 134 sectors to 177fffc0 sector 8a, count 134 Jumping to U-Boot... first register content 0x56190527 register content 0x37a54f33 register content 0x41564c62 register content 0xe4650200 register content 0x8017 register content 0x8017 register content 0xfcc1bb90 register content 0x50211 register content 0x6f422d55 ----------- register content 0x17 register content 0x17820c14 register content 0x17 register content 0x17820c44 register content 0x17 register content 0x0 register content 0x0 register content 0x0 image entry point: 0x17800000