On Wed, 8 Jan 2020 at 18:00, Pete Batard <p...@akeo.ie> wrote:
>
> Some (all?) Raspbery Pi 4 platforms report 0x0000000010000000 as their
> board serial when queried through the VideoCore mailbox.
>
> Fix this by using the MAC address then.
>
> Signed-off-by: Pete Batard <p...@akeo.ie>
> ---
> Platform/RaspberryPi/Drivers/RpiFirmwareDxe/RpiFirmwareDxe.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/Platform/RaspberryPi/Drivers/RpiFirmwareDxe/RpiFirmwareDxe.c
> b/Platform/RaspberryPi/Drivers/RpiFirmwareDxe/RpiFirmwareDxe.c
> index dd61ef089ca7..75826fdc0e53 100644
> --- a/Platform/RaspberryPi/Drivers/RpiFirmwareDxe/RpiFirmwareDxe.c
> +++ b/Platform/RaspberryPi/Drivers/RpiFirmwareDxe/RpiFirmwareDxe.c
> @@ -394,8 +394,9 @@ RpiFirmwareGetSerial (
> }
>
> *Serial = Cmd->TagBody.Serial;
> - // Some platforms return 0 for serial. For those, try to use the MAC
> address.
> - if (*Serial == 0) {
> + // Some platforms return 0 or 0x0000000010000000 for serial.
> + // For those, try to use the MAC address.
> + if ((*Serial == 0) || ((*Serial & 0xFFFFFFFF0FFFFFFFULL) == 0)) {
What is the point of using a mask here? Is it deliberately matching
0x0000000020000000 or 0x00000000F0000000 as well?
> Status = RpiFirmwareGetMacAddress ((UINT8*) Serial);
> // Convert to a more user-friendly value
> *Serial = SwapBytes64 (*Serial << 16);
> --
> 2.21.0.windows.1
>
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