I have just updated the DreamPlug to kernel 3.11.5, without any problems, but also tried 3.12-rc5, with – as usual – no success..

My DreamPlug – presumably one of the earlier models – is actually a ‘GuruPlug Reference Board‘ inside:

# cat /proc/cpuinfo
processor       : 0
model name      : Feroceon 88FR131 rev 1 (v5l)
BogoMIPS        : 1191.11
Features        : swp half thumb fastmult edsp
CPU implementer : 0x56
CPU architecture: 5TE
CPU variant     : 0x2
CPU part        : 0x131
CPU revision    : 1

Hardware        : Marvell GuruPlug Reference Board
Revision        : 0000
Serial          : 0000000000000000

U-Boot shows:

Marvell-DreamPlug
SoC:   Kirkwood 88F6281_A0
DRAM:  512 MiB
SF: Detected MX25L1606 with page size 256, total 1 MiB
In:    serial
Out:   serial
Err:   serial
Net:   egiga0, egiga1
88E1121 Initialized on egiga0
88E1121 Initialized on egiga1

For 3.12-rc, I enabled all the ‘Marvell’ types and (deliberately) temporarily disabled ‘Embedded system’, and got:

Uncompressing Linux... done, booting the kernel.
Error: unrecognized/unsupported machine ID (r1 = 0x00000a63).
Available machine support:
ID (hex)        NAME
00000b44        Marvell OpenRD Ultimate Board
00000939        Marvell OpenRD Client Board
00000915        Marvell OpenRD Base Board
00000691        Marvell RD-88F6192-NAS Development Board
00000692        Marvell RD-88F6281 Reference Board
ffffffff        Marvell Kirkwood (Flattened Device Tree)
Please check your kernel config and/or bootloader.

0a63(hex) is 2659(dec), which is, in ~/arch/arm/tools/mach-types:
guruplug        MACH_GURUPLUG        GURUPLUG        2659

This is the same as in the corresponding file in the 3.11 kernel source tree, but there seem to be no ‘guruplug’ options available in 3.12rc, apart from ~/arch/arm/boot/dts/kirkwood-guruplug-server-plus.dts, which works when used to create the uImage in 3.11.x, but fails in 3.12-rc.

I am running out of testing options, now, and unless I can find a reference to this issue, I might eventually post a question on the appropriate kernel mailing list..

Robert Gadsdon   October 14, 2013.