Hi Al,

Below is a dmesg excerpt corresponding to the acpi_boot_table_init().

[    0.000000] ACPI: RSDP 0x00000047FA397014 000024 (v02 APM   )
[    0.000000] ACPI: XSDT 0x00000047FA3960E8 000064 (v01 APM    XGENE    00000003      01000013)
[    0.000000] ACPI: FACP 0x00000047FA38E000 00010C (v05 APM    XGENE    00000003 INTL 20141107)
[    0.000000] ACPI: DSDT 0x00000047FA38F000 003D82 (v05 APM    APM88xxx 00000001 INTL 20141107)
[    0.000000] ACPI: DBG2 0x00000047FA393000 0000AA (v00 APMC0D XGENEDBG 00000000 INTL 20141107)
[    0.000000] ACPI: GTDT 0x00000047FA38C000 0000E0 (v02 APM    XGENE    00000001 INTL 20141107)
[    0.000000] ACPI: MCFG 0x00000047FA38B000 00003C (v01 APM    XGENE    00000002 INTL 20141107)
[    0.000000] ACPI: SPCR 0x00000047FA38A000 000050 (v02 APMC0D XGENESPC 00000000 INTL 20141107)
[    0.000000] ACPI: SSDT 0x00000047FA389000 00002D (v02 APM    XGENE    00000001 INTL 20141107)
[    0.000000] ACPI: APIC 0x00000047FA388000 0002A4 (v03 APM    XGENE    00000003      01000013)
[    0.000000] ACPI: SSDT 0x00000047FA387000 000063 (v02 REDHAT MACADDRS 00000001      01000013)

I've been testing the Mustang topic branch on the platform with the Rev 1 CPUs with 32 GB memory.

On 8/18/15 8:02 AM, Itaru Kitayama wrote:

Hi Al,

Even with your .config the HEAD of acpi-topic-mustang does not boot with acpi=force.
Here are the messages appear on the console:

EFI stub: Booting Linux Kernel...
EFI stub: Using DTB from configuration table
EFI stub: Exiting boot services and installing virtual address map...
XhcClearBiosOwnership: called to clear BIOS ownership
XhcClearBiosOwnership: called to clear BIOS ownership
L3c Cache: 8MB

On 8/18/15 6:58 AM, Itaru Kitayama wrote:

Hi Al,

>Where does it "stall"? What's the last message you see? And if you're not
>using earlycon, please do so; that will help determine how far the boot is
>getting.

If I boot it with acpi=force, no output. Does my usage below look correct?

GRUB_CMDLINE_LINUX="earlycon=uart8250,mmio32,0x1c021000 acpi=force console=ttyS0,115200 loglevel=7"

>How were those checked?

In setup_arch() I was calling disable_acpi() right after the acpi_boot_table_init() call
as that makes the system get to the prompt.

I am about to build the kernel with your .config and test it on one of Mustangs
in the Linaro Austin lab. The Boot firmware version is 1.1.0-rh-0.15.

Itaru