I have this problem too. ESC key shows 8GB, Memmap in efi shell shows 2gb. Osx says 8gb. Ubuntu says 2gb (macbookpro10,1) uefipayload.. do u need the hw_probe info? Can I ask in tiancore.buzilla ? fastly is down

why the 6gb ram is reserved?? (Reserved 0000000100000000-000000027C5FFFFF 000000000017C600 000000000000000F`) 1558016 pages

RT_Data 000000007FF41000-000000007FF41FFF 0000000000000001 800000000000000F

BS_Data 000000007FF42000-000000007FF42FFF 0000000000000001 000000000000000F

Reserved 0000000000000000-0000000000000FFF 0000000000000001 000000000000000F

Reserved 00000000000A0000-00000000000FFFFF 0000000000000060 000000000000000F

Reserved 000000007FF43000-00000000829FFFFF 0000000000002ABD 000000000000000F

Reserved 00000000F0000000-00000000F3FFFFFF 0000000000004000 000000000000000F

Reserved 00000000FED90000-00000000FED91FFF 0000000000000002 000000000000000F

Reserved 0000000100000000-000000027C5FFFFF 000000000017C600 000000000000000F

Reserved : 1,585,445 Pages (6,493,982,720 Bytes)

LoaderCode: 580 Pages (2,375,680 Bytes)

LoaderData: 0 Pages (0 Bytes)

BS_Code : 1,239 Pages (5,074,944 Bytes)

BS_Data : 8,252 Pages (33,800,192 Bytes)

RT_Code : 77 Pages (315,392 Bytes)

RT_Data : 239 Pages (978,944 Bytes)

ACPI_Recl : 1 Pages (4,096 Bytes)

ACPI_NVS : 2 Pages (8,192 Bytes)

MMIO : 0 Pages (0 Bytes)

MMIO_Port : 0 Pages (0 Bytes)

PalCode : 0 Pages (0 Bytes)

Available : 513,607 Pages (2,103,734,272 Bytes)

Persistent: 0 Pages (0 Bytes)

--------------

Total Memory: 2,046 MB (2,146,291,712 Bytes)

(Grub 2 is fine, ubuntu detects 8gb) [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x0000000000000fff] type 16 [ 0.000000] BIOS-e820: [mem 0x0000000000001000-0x000000000009ffff] usable [ 0.000000] BIOS-e820: [mem 0x00000000000a0000-0x00000000000fffff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000007ff44fff] usable [ 0.000000] BIOS-e820: [mem 0x000000007ff45000-0x000000007fffffff] type 16 [ 0.000000] BIOS-e820: [mem 0x0000000080000000-0x00000000829fffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000f0000000-0x00000000f3ffffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000fed90000-0x00000000fed91fff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000027c5fffff] usable

[ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000027c5fffff] usable

coreboot cbmem says 10. 0000000100000000-000000027c5fffff: RAM

from uefipayload tianocore 8. 0000000100000000 - 000000027C5FFFFF [01]

buildhob: base = 0x100000000, size = 0x17C600000, type = 0x0

ConvertPages: failed to find range 100000000 - 27C5FFFFF

(I hope the enable tianocore logging in cbmem is useful here..)