Re: [PATCH 4/8] x86/intel_rct/mba: Add MBA structures and initialize MBA

[Shivappa Vikas]

On Mon, 3 Apr 2017, Tracy Smith wrote:

> Hi All,
>
> No JTAG available and need to understand why Linux 4.8.3 doesn't boot on a
> x86_64 corei7-64.  Hangs at the typical "Starting kernel" location after
> the last message of the U-boot.  The bootcmd is given below.

Do you see the issue when you apply MBA patches . It seems like you use 4.8 
kernel but the mba patches are dependent on :
https://marc.info/?l=linux-kernel&m=149125583824700

which is applied on 4.11-rc4.

> See a fault FFS and a message indicating the image didn't load after
> failover.
>
> 1) How can I verify if the kernel image was loaded from uboot
> 2) What is this fault?
> 3) Has the bootargs or bootcmd changed between 4.1 and 4.8.3?
> 4) If the boot cmd/arg has changed, what should the boot cmd/arg be for
> 4.8.3 to boot on x86_64 corei7-64?
>
> Initial RAM disk at linear address 0x20000000, size 11638378 bytes
> Kernel command line: "BOOT_IMAGE=/imgx/bzImage LABEL=BOOT root=/dev/ram0
> imgmnt=/media/sda2 imgdir=imgx img=image.rootfs rootdelay=2 slub_debug=F
> console=ttyS1,115200  bootcount=1 bootcount_addr=0xa4000
> acpi_enforce_resources=lax pram_size=0x800000 pram_addr=10000000
> pram_loc=ddr crashkernel=128M memmap=0x800000$0x10000000  "
> EFI table at 683392c0, mmap 68339300, mmap size 4c0, version 1, descr. size
> 0x30
>
> Starting kernel ...
>
> Timer summary in microseconds:
>       Mark    Elapsed  Stage
>          0          0  reset
>          1          1  board_init_r
>        105        104  board_init_f
> 10,180,048 10,179,943  id=64
> 10,221,985     41,937  id=65
> 10,356,645    134,660  main_loop
> 12,366,521  2,009,876  usb_start
> 18,747,284  6,380,763  start_kernel
> Accumulated time:
>            10,162,689  ahci
>
> On a 4.1.26-yocto-standard #1 SMP it boots with no issues.  Basically same
> .config used in both cases except for anything deprecated between 4.1 and
> 4.8.3.
>
> root@:~# cat /proc/cmdline
> BOOT_IMAGE=/imgy/bzImage LABEL=BOOT root=/dev/ram0 imgmnt=/media/sda2
> imgdir=imgy img=image.rootfs rootdelay=2 slub_debug=F console=ttyS1,115200
> fault=FFS bootcount=3 bootcount_addr=0xa4000  acpi_enforce_resources=lax
> pram_size=0x800000 pram_addr=10000000 pram_loc=ddr crashkernel=128M
> memmap=0x800000$0x10000000
> root@CLX3001:~# cat /proc/consoles
> ttyS1                -W- (EC p a)    4:65
> netcon0              -W- (E     )
>
> thx,
> Tray