[coreboot] USB debug cables and emulation

Joseph Smith joe at settoplinux.org
Thu Jun 26 19:26:39 CEST 2008

On Thu, 26 Jun 2008 19:06:08 +0200, Carl-Daniel Hailfinger
<c-d.hailfinger.devel.2006 at gmx.net> wrote:
> On 26.06.2008 18:48, Joseph Smith wrote:
>>>> I read somewhere you could make one, but I don't know how difficult
> that
>>>> would be. I was always wondering if you could just use two USB ->
> Serial
>>>> adapters with a null modem cable in the middle??
>>> Nope, won't work. You need a USB device that explicitly understands USB
>>> debug mode. In this mode you don't have to set up the BARs (ie no
> memory
>>> required) to talk USB.
>> This guy was able to get it working with one USB -> Serial adapter
>> (reversed) on an iMac (with ICH7) using Solaris as the host:
>> http://blogs.sun.com/szhou/entry/solaris_on_efi_imac
> The blog entry explicitly states that it didn't work.
Than you did not read all of it. At the end"I was finally able to get
console output on the iMac"

Joseph Smith

More information about the coreboot mailing list