Hi All, I am working on enabling PCIe passthrough on qemu risc-v, in order for the guest to access the host x86 pci resource directly, ram on guest won't cover this range, so if guest has 4GB ram, two ranges are created: 1. 2G-3G 2. 4G-7G
u-boot is not able to handle this but reports: Reserving 869k for U-Boot at: ff725000 initcall: 0000000080216f94 Reserving 8320k for malloc() at: fef05000 initcall: 0000000080216ee8 Unhandled exception: Store/AMO access fault EP: 0000000080201a38 RA: 0000000080216f10 TVAL: 00000000fef04f90 It looks like fdtdec_setup_mem_size_base() in u-boot sets ram_base/size without considering all memory nodes, and board_get_usable_ram_top() returns 4G-1 that causes gd->relocaddr set to the wrong address which has no ram backed. More details can be found here: https://patchew.org/QEMU/20230731015317.1026996-1-fei2...@intel.com/ Can we add support for this multi-range ram setting? Any comments? Thanks, Fei.
