An update, CubeMX DDR test suite is not working simply because the tuning support was removed from the SPL (ref. https://patchwork.ozlabs.org/project/uboot/patch/20211115153214.3.I4594adfd3e69b68a60bdbb2697ae8b97c9f3e8f5@changeid/). This renders the whole tool unusable.
Anyway, there is not much gain in using the Cube MX tool, the same commands can be accessed using a serial terminal.
Results of the previously mentioned tests:
U-Boot SPL 2022.04-rc4-00004-ge349f88a-dirty (Mar 26 2022 - 10:39:31 +0100)
RAM: LPDDR3 16bits 533000kHz
0:DDR_RESET
DDR>next
1:DDR_CTRL_INIT_DONE
DDR>next
2:DDR PHY_INIT_DONE
DDR>next
3:DDR_READY
DDR>test 1
execute 1:Simple DataBus
Result: Failed [0xc0000000: error for bits 0x1]
DDR>test 2
execute 2:DataBusWalking0
running 100 loops at 0xc0000000
Result: Failed [loop 1: error for bits 0xffffffff]
DDR>test 3
execute 3:DataBusWalking1
running 100 loops at 0xc0000000
Result: Failed [loop 1: error for bits 0xedf7dbff]
DDR>test 4 0x100
execute 4:AddressBus
running at 0xc0000000 length 0x100
Result: Failed [0xc0000000: error for address 0xc0000004]
Running test 3 repeatedly gives different, but very similar results:
DDR>test 3
execute 3:DataBusWalking1
running 100 loops at 0xc0000000
Result: Failed [loop 1: error for bits 0xdbedf7ff]
DDR>test 3
execute 3:DataBusWalking1
running 100 loops at 0xc0000000
Result: Failed [loop 1: error for bits 0xf7dbedff]
DDR>test 3
execute 3:DataBusWalking1
running 100 loops at 0xc0000000
Result: Failed [loop 1: error for bits 0xdbedf7ff]
DDR>test 3
execute 3:DataBusWalking1
running 100 loops at 0xc0000000
Result: Failed [loop 1: error for bits 0xedf7dbff]
I tried two different boards, reworked both STM32MP1 and LPDDR3. No other progress so far. I am suspecting a configuration error or a wrong register computation for LPDDR3 by CubeMX. Setting DDR parameters one by one according to the datasheet + relaxing them a bit, CubeMX was able to generate an obviously wrong configuration (eg. overflowing 32 bit registers).
Is there a known working LPDDR3 16bit 533 MHz configuration DTS available @ST?
Thanks.
