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The ASL 2.0 syntax for "!X" resolves to "LNot(X)" which will evaluate
the object as an integer and turn into a boolean. This may not do the
right thing if the object is actually a string and it can lead to
unexpected behavior.
Instead be specific about the object type and check for zero or an
empty string depending on what is being returned.
This fixes an issue where some VPD keys were causing the search to
stop and miss subsequent entries.
Change-Id: I1688842964f9c2f81ca31073da9c2d71a8c81767
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32694
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
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The r8152 kernel driver is expecting the AMAC() method to return
a raw buffer, not a string. To fix this simply remove the
ToString() in the return statement that was converting the buffer
to a string.
BUG=b:123925776
Change-Id: I7cd4244a1ccc7397d5969b817a52ea48867b4d17
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31807
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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This change adds support for providing a MAC address that can be used
by the OS network drivers to change the MAC address that a NIC uses.
The Realtek r8152 driver in the Linux kernel supports a MAC address
passthru feature which can result in the dock ethernet port using the
same MAC address that is assigned to the internal NIC. This is done
by calling an ACPI method at \_SB.AMAC() which returns a formatted
string containing the MAC address for the dock to use.
The Linux kernel implementation can be found at
drivers/net/usb/r8152.c:vendor_mac_passthru_addr_read()
This is implemented specifically for Chrome OS as it relies on VPD
to determine the MAC address to supply.
The policy which controls where the dock MAC address comes from is
written into RW_VPD property "dock_passthru":
"dock_mac" or empty: Use MAC address from RO_VPD value "dock_mac"
"ethernet_mac0": Use MAC address from RO_VPD value "ethernet_mac0"
"builtin": existing dock MAC address (return nothing)
The MAC address in VPD is the standard format AA:BB:CC:DD:EE:FF and
it must be converted into the string format expected by the OS which
involves some string manipulation which ACPI is not great at handling.
BUG=b:123925776
TEST=this was tested on a sarien board by setting the VPD keys to
their expected values and observing if the AMAC() method returns the
expected string.
Change-Id: I3335e5d924155431e299844e2aaace62168294e0
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/31669
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lijian Zhao <lijian.zhao@intel.com>
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