This issue was fixed in mainline u-boot but is still not backported to NXP’s BSP. pci: Update the highest subordinate bus number for bridge setup (19e1b8d9) · Commits · U-Boot / U-Boot · GitLab
Additionally there is a bug that I debugged in another thread that needs to be patched in our device-tree. Pci kernel panic when upgrading to latest - #12 by jnettlet