Hi,
we've discussed this briefly at OSFC: Linux's ELF file (vmlinux) currently has segments starting at 0x0 (if you look at the physical address field) and an entry point at 0xffffffe000000000:
$ readelf -l vmlinux
Elf file type is EXEC (Executable file) Entry point 0xffffffe000000000 There are 3 program headers, starting at offset 64
Program Headers: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flags Align LOAD 0x0000000000001000 0xffffffe000000000 0x0000000000000000 0x000000000000ffce 0x000000000000ffce R E 0x1000 LOAD 0x0000000000011000 0xffffffe000010000 0x0000000000010000 0x00000000002cda3c 0x00000000002cda3c RWE 0x1000 NOTE 0x00000000002dea00 0xffffffe0002dda00 0x00000000002dda00 0x000000000000003c 0x000000000000003c R 0x4
Section to Segment mapping: Segment Sections... 00 .init.text 01 .init.data .exit.text .data..percpu .text .softirqentry.text .rodata __param __modver .srodata .data __bug_table .sdata .bss __ex_table .notes 02 .notes
coreboot's SELF loader rightly points out that 0x0 is not in RAM:
Loading segment from ROM address 0x00000000200287b8 code (compression=0) New segment dstaddr 0x0 memsize 0xffce srcaddr 0x2002880c filesize 0xffce Loading segment from ROM address 0x00000000200287d4 code (compression=0) New segment dstaddr 0x10000 memsize 0x2cda3c srcaddr 0x200387da filesize 0x2cda3c Loading segment from ROM address 0x00000000200287f0 Entry Point 0xffffffe000000000 SELF Payload doesn't target RAM: Failed Segment: 0x0, 65486 bytes 0. 0000000080000000-0000000080011fff: RAMSTAGE
- 0000000080012000-000000008003ffff: RAM
- 0000000080040000-0000000080044fff: RAMSTAGE
- 0000000080045000-00000000fffdbfff: RAM
- 00000000fffdc000-00000000ffffffff: CONFIGURATION TABLES
- 0000000100000000-000000027fffffff: RAM
Payload not loaded.
How should we solve this?
One option I see is to keep CONFIG_PAYLOAD_ELF as is, and add quirks to CONFIG_PAYLOAD_LINUX.
Jonathan