Remaining EFI Xen on ARM issues (on Juno at least)

[Ian Campbell <Ian.Campbell@citrix.com>]

(trimming the CC list a bit)

On Tue, 2014-10-21 at 09:17 +0100, Ian Campbell wrote:
> and applied.

So with this in place I'm seeing a couple of remaining issues (running
on Juno). I've loaded xen.efi, Image, juno.dtb and a file called cfg
into NOR, cfg contains:

        [global]
        default=default
        
        [default]
        options=console=dtuart dtuart=serial0 conswitch=x
        kernel=Image console=hvc0 earlycon=pl011,0x7ff80000 rootwait root=/dev/sda1
        dtb=juno
        
(nb the juno firmware strips the extensions, hence juno not juno.dtb)

I've used the boot manager to create a boot entry:
        [1] Linux from NOR Flash
        [2] Linux EFI TFTP
        [3] Xen from NOR Flash
        [4] Shell
        [5] Boot Manager
        Start: 5
        [1] Add Boot Device Entry
        [2] Update Boot Device Entry
        [3] Remove Boot Device Entry
        [4] Reorder Boot Device Entries
        [5] Update FDT path
        [6] Set Boot Timeout
        [7] Return to main menu
        Choice: 1
        [1] NOR Flash (63 MB)
        [2] Firmware Volume (63 MB)
        [3] Firmware Volume (63 MB)
        [4] VenHw(E7223039-5836-41E1-B542-D7EC736C5E59)
        [5] VenHw(02118005-9DA7-443A-92D5-781F022AEDBB)
        [6] PXE on MAC Address: 00:02:F7:00:58:73
        [7] TFTP on MAC Address: 00:02:F7:00:58:73
        Select the Boot Device: 1
        File path of the EFI Application or the kernel: xen
        Is your application is an OS loader? [y/n] n
        Arguments to pass to the EFI Application: -cfg=cfg
        Description for this new Entry: Xen from NOR Flash (2nd try)
        
Then:
        [1] Linux from NOR Flash
        [2] Linux EFI TFTP
        [3] Xen from NOR Flash
        [4] Xen from NOR Flash (2nd try)
        [5] Shell
        [6] Boot Manager
        Start: 4
        Xen 4.5-unstable (c/s Mon Oct 20 20:55:25 2014 -0700 git:91086d0) EFI loader
        No configuration file found.
        [1] Linux from NOR Flash
        [2] Linux EFI TFTP
        [3] Xen from NOR Flash
        [4] Xen from NOR Flash (2nd try)
        [5] Shell
        [6] Boot Manager
        Start:

But if I use the shell (fs2: is the NOR flash)

        Press ESC in 5 seconds to skip startup.nsh or any other key to continue.
        Shell> fs2:
        FS2:\> dir
        Directory of: FS2:\
        00/00/0000  00:00           1,071,716  fip
        00/00/0000  00:00             755,472  xen
        00/00/0000  00:00           6,325,424  Image
        00/00/0000  00:00              10,185  juno
        00/00/0000  00:00                 172  cfg
        00/00/0000  00:00              12,296  bl1
                  6 File(s)   8,175,265 bytes
                  0 Dir(s)
        FS2:\> xen -cfg=cfg
        Xen 4.5-unstable (c/s Mon Oct 20 20:55:25 2014 -0700 git:91086d0) EFI loader
        juno: 0x00000009fadf7000-0x00000009fadf97c9
        Image: 0x00000009fa405000-0x00000009faa0d4b0
        - UART enabled -
        - CPU 00000100 booting -
        - Current EL 00000008 -
        - Xen starting at EL2 -
        - Zero BSS -
        - Setting up control registers -
        - Turning on paging -
        - Ready -
        (XEN) Checking for initrd in /chosen
        (XEN) RAM: 0000000080000000 - 00000000dfffffff
        (XEN) RAM: 00000000e00f0000 - 00000000febcffff
        (XEN) RAM: 00000000febd7000 - 00000000feffffff
        (XEN) RAM: 0000000880000000 - 00000009fa404fff
        (XEN) RAM: 00000009fac05000 - 00000009fada9fff
        (XEN) RAM: 00000009fadab000 - 00000009fadf2fff
        (XEN) RAM: 00000009fadf7000 - 00000009fadf8fff
        (XEN) RAM: 00000009fadfd000 - 00000009faf6efff
        (XEN) RAM: 00000009fafaa000 - 00000009fe42afff
        (XEN) RAM: 00000009fe42b000 - 00000009fe918fff
        (XEN) RAM: 00000009fe919000 - 00000009fec4efff
        
So it works from the shell but not the boot manager. I wondered if it
might relate to UEFI's equivalent of $CWD at the point it loads xen vs
the point at which xen tries to read things, so I've tried various
things like -cfg=fs2:\cfg (with various combinations of /, \ and
nothing) in the boot mgmr with no luck.

The second issue is that sometimes:
        FS2:\> xen -cfg=cfg
        Xen 4.5-unstable (c/s Mon Oct 20 20:55:25 2014 -0700 git:91086d0) EFI loader
        juno: 0x00000009fadf9000-0x00000009fadfb7c9
        Image: 0x00000009fa405000-0x00000009faa0d4b0
        Cannot obtain memory map: ErrCode: 0x8000000000000005

I'm not sure but this seems to correlate at least somewhat with trying
(unsuccessfully) trying to use the boot manager path before dropping to
the shell. It invariable works on a second attempt.

Anyone got any ideas on any of this?

Ian.