[coreboot] HP Pavilion 14 Chromebook - AKA Butterfly

John Lewis jlewis at johnlewis.ie
Mon Oct 21 14:02:12 CEST 2013


> Let's reduce the number of unknowns and try to replicate the setup I
> have here as close as possible:
> 1. Use your samsung/lumpy instead of google/butterfly for the 
> testing.
> 2. Use stty, cat and picocom as described on the wiki page.
> 3. Install archlinux-arm on the BBB. The one I use has kernel tagged
> with version string 3.8.13-7-ARCH. With the patches for the gadget
> driver there is also a pre-built and patched g_dbgp module to be used
> with this kernel.
> Kyösti

Hi Kyösti,

Trying to load ehci then usbserial_usbdebug module in Grub on Lumpy 
gives "error: no transfer descriptors available for EHCI transfer".

I've got a more verbose log for Butterfly, and it looks to me as though 
it's having trouble with graphics, as well as not actually loading the 
payload (possibly intertwined?). Help!

CBFS: Looking for 'pci8086,0106.rom' starting from 0x600000.
CBFS:  - load entry 0x600000 file name (16 bytes)...
CBFS:  (unmatched file @0x600000: cmos_layout.bin)
CBFS:  - load entry 0x6004c0 file name (32 bytes)...
CBFS: Found file (offset=0x6004f8, len=65536).
In CBFS, ROM address for PCI: 00:02.0 = ffe004f8
PCI expansion ROM, signature 0xaa55, INIT size 0x10000, data ptr 0x0040
PCI ROM image, vendor ID 8086, device ID 0106,
PCI ROM image, Class Code 030000, Code Type 00
Copying VGA ROM Image from ffe004f8 to 0xc0000, 0x10000 bytes
Real mode stub @00000600: 867 bytes
Calling Option ROM...
int15_handler: INT15 function 1000!
Unknown INT15 function 1000!
... Option ROM returned.
VBE: Getting information about VESA mode 4117
VBE: resolution:  1024x768 at 16
VBE: framebuffer: d0000000
VBE: Setting VESA mode 4117
int15_handler: INT15 function e873!
Unknown INT15 function e873!
VGA Option ROM has been loaded
GT Power Management Init (post VBIOS)

See attached.

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