Hello Leif,
the Wandboard Quad rev B1 cannot be booted via U-Boot, GRUB-efi-arm. GRUB loads the initial ramdisk into an area which the the mainline 4.19.55 kernel simply does not accept because it thinks the minimum address is 0x68000000 and not 0x10000000. Booting via bootz works without problem.
Did you see a similar problems before?
This is the memory map when it is last read from U-Boot.
typ, phys, virt, pages, attrib 00000002, 8f797000, 8f797000, 869, 8 00000005, 8f796000, 8f796000, 1, 8000000000000008 00000002, 8dd8c000, 8dd8c000, 1a0a, 8 00000000, 8dd8b000, 8dd8b000, 1, 8 00000006, 8dd8a000, 8dd8a000, 1, 8000000000000008 00000000, 8dd83000, 8dd83000, 7, 8 00000006, 8dd82000, 8dd82000, 1, 8000000000000008 00000000, 8dd7e000, 8dd7e000, 4, 8 00000001, 8dd67000, 8dd67000, 17, 8 00000004, 8dd66000, 8dd66000, 1, 8 00000000, 8dd64000, 8dd64000, 2, 8 00000002, 8dd63000, 8dd63000, 1, 8 00000006, 8dd62000, 8dd62000, 1, 8000000000000008 00000002, 8dd61000, 8dd61000, 1, 8 00000001, 6e60c000, 6e60c000, 1f755, 8 00000002, 6e1f8000, 6e1f8000, 414, 8 00000001, 6dded000, 6dded000, 40b, 8 00000002, 6ddec000, 6ddec000, 1, 8 00000004, 6ddeb000, 6ddeb000, 1, 8 00000002, 6dde9000, 6dde9000, 2, 8 00000007, 2ffff000, 2ffff000, 3ddea, 8 00000002, 2e1f1000, 2e1f1000, 1e0e, 8 00000007, 17f0c000, 17f0c000, 162e5, 8 00000004, 17f00000, 17f00000, c, 8 00000002, 17d00000, 17d00000, 200, 8 00000007, 1240b000, 1240b000, 58f5, 8 00000002, 12000000, 12000000, 40b, 8 00000004, 10000000, 10000000, 2000, 8
The initial ramdisk is loaded at 2e1f1000.
The problem occurs in drivers/of/fdt.c where some memory areas including the one containig the initial ramdisk are excluded. I have added some extra debug lines to early_init_dt_add_memory_arch().
[ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 4.19.55-armmp (zfsdt@family) (gcc version 8.3.0 (Debian 8.3.0-6)) #8 SMP Sat Jun 29 17:04:52 CES9 [ 0.000000] CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c5387d [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache [ 0.000000] OF: fdt: Machine model: Wandboard i.MX6 Quad Board rev B1 [ 0.000000] OF: fdt: base 10000000 < phys_offset 68000000 [ 0.000000] OF: fdt: Ignoring memory range 0x10000000 - 0x68000000 [ 0.000000] bootconsole [earlycon0] enabled [ 0.000000] Memory policy: Data cache writealloc [ 0.000000] efi: Getting EFI parameters from FDT: [ 0.000000] efi: EFI v2.80 by Das U-Boot [ 0.000000] efi: SMBIOS=0x8dd82000 [ 0.000000] OF: fdt: base 0000000010000000 + size 0000000002000000 < phys_offset 0000000068000000 [ 0.000000] OF: fdt: Ignoring memory block 0x10000000 - 0x12000000 [ 0.000000] OF: fdt: base 0000000012000000 + size 000000000040b000 < phys_offset 0000000068000000 [ 0.000000] OF: fdt: Ignoring memory block 0x12000000 - 0x1240b000 [ 0.000000] OF: fdt: base 000000001240b000 + size 00000000058f5000 < phys_offset 0000000068000000 [ 0.000000] OF: fdt: Ignoring memory block 0x1240b000 - 0x17d00000 [ 0.000000] OF: fdt: base 0000000017d00000 + size 0000000000200000 < phys_offset 0000000068000000 [ 0.000000] OF: fdt: Ignoring memory block 0x17d00000 - 0x17f00000 [ 0.000000] OF: fdt: phys_offset 0000000068000000 [ 0.000000] OF: fdt: base 0000000017f00000 + size 000000000000c000 < phys_offset 0000000068000000 [ 0.000000] OF: fdt: Ignoring memory block 0x17f00000 - 0x17f0c000 [ 0.000000] OF: fdt: phys_offset 0000000068000000 [ 0.000000] OF: fdt: base 0000000017f0c000 + size 00000000162e5000 < phys_offset 0000000068000000 [ 0.000000] OF: fdt: Ignoring memory block 0x17f0c000 - 0x2e1f1000 [ 0.000000] OF: fdt: phys_offset 0000000068000000 [ 0.000000] OF: fdt: base 000000002e1f1000 + size 0000000001e0e000 < phys_offset 0000000068000000 [ 0.000000] OF: fdt: Ignoring memory block 0x2e1f1000 - 0x2ffff000 [ 0.000000] INITRD: 0x2e1f1000+0x01e0e000 is not a memory region - disabling initrd [ 0.000000] cma: Reserved 16 MiB at 0x8e000000 [ 0.000000] Unable to handle kernel paging request at virtual address 6fd00000 [ 0.000000] pgd = (ptrval) [ 0.000000] [6fd00000] *pgd=00000000 [ 0.000000] Internal error: Oops: 5 [#1] SMP ARM [ 0.000000] Modules linked in: [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.19.55-armmp #8 [ 0.000000] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) [ 0.000000] PC is at fdt_check_header+0xc/0x80 [ 0.000000] LR is at __unflatten_device_tree+0x4c/0x274 [ 0.000000] pc : [<c0ae9d48>] lr : [<c09696dc>] psr: 200000d3 [ 0.000000] sp : c1201ec0 ip : c1201ed0 fp : c1201ecc [ 0.000000] r10: c1316340 r9 : 00000000 r8 : c135e308 [ 0.000000] r7 : 00000000 r6 : 6fd00000 r5 : c1074be8 r4 : c1074be8 [ 0.000000] r3 : c1074be8 r2 : c135e308 r1 : 00000000 r0 : 6fd00000 [ 0.000000] Flags: nzCv IRQs off FIQs off Mode SVC_32 ISA ARM Segment none [ 0.000000] Control: 10c5387d Table: 6820404a DAC: 00000051 [ 0.000000] Process swapper (pid: 0, stack limit = 0x(ptrval)) [ 0.000000] Stack: (0xc1201ec0 to 0xc1202000) [ 0.000000] 1ec0: c1201efc c1201ed0 c09696dc c0ae9d48 c1074be8 c1074be8 c1209900 8fffffff [ 0.000000] 1ee0: 8f980000 c1349880 e7fffc80 c1316340 c1201f1c c1201f00 c1076000 c096969c [ 0.000000] 1f00: 00000000 c1201f10 c0358230 c1083028 c1201fa4 c1201f20 c1004a38 c1075fc8 [ 0.000000] 1f20: ffffffff 10c5387d c03bcd50 c03bc83c c0d61908 c0d6349c c1205dcc c1201fbc [ 0.000000] 1f40: c0e340c8 fffff000 c1201fa4 c1201f58 c1022158 c0af8b54 c1205dcc c1205dcc [ 0.000000] 1f60: c1205dcc ffffffff c1201f94 c1201f78 c03bd0c8 00000000 c1201f9c 00000000 [ 0.000000] 1f80: c1205dcc c1205dcc ffffffff c1205dc0 412fc09a 10c5387d c1201ff4 c
Best regards
Heinrich