[coreboot] x60 : adding WWAN support
coreboot at guylhem.net
Mon Sep 1 22:19:26 CEST 2014
I'm interested in WWAN support, mostly for the GPS features and the cool
things you can do with them (like a stratum ntp server).
I was told a EM770W doesn't even need a network registration to output NMEA
so I got one.
I looked at patch #4056 which enable WWAN for the EC, but it seems to only
part of the job: the ACPI table should also contain a GWAN key for
In drivers/platform/x86/thinkpad_acpi.c, you can see different references
/* ACPI GWAN/SWAN bits */
TP_ACPI_WANCARD_HWPRESENT = 0x01, /* Wan hw available */
TP_ACPI_WANCARD_RADIOSSW = 0x02, /* Wan radio enabled */
TP_ACPI_WANCARD_RESUMECTRL = 0x04, /* Wan state at resume:
0 = disable, 1 = enable
In wan_get_status :
if (!acpi_evalf(hkey_handle, &status, "GWAN", "d"))
Apparently, this last part cause the WWAN card not to be handled by
thinkpad-acpi, which would otherwise provide rfkill support (usefull to
save power, something I'd like to improve)
In acpi-3.dsl Scope (\_SB.PCI0.LPC.EC.HKEY, I see entries for both GWAN and
SWAN, and other things (WGPS, but what does it means???)
I believe similar entries should be added to coreboot asl, but I'm not sure
of how integrated they should be. If I understand correctly, following the
logic of patch #5242, there should be a conditional statement then some
If anyone is willing to submit a patch, I would be happy to test it.
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