On Tue, Oct 08, 2019 at 01:38:41PM +0100, Pete Batard wrote:
> The board revision is the proper channel to use to detect the amount of
> RAM available as bits [20-22] report the effective RAM size for the board
> starting with 256 MB (000b) and doubling in size for each value.
>
> Signed-off-by: Pete Batard <p...@akeo.ie>
Reviewed-by: Leif Lindholm <leif.lindh...@linaro.org>
> ---
> Platform/RaspberryPi/RPi3/Drivers/PlatformSmbiosDxe/PlatformSmbiosDxe.c | 18
> ++++++++++++------
> 1 file changed, 12 insertions(+), 6 deletions(-)
>
> diff --git
> a/Platform/RaspberryPi/RPi3/Drivers/PlatformSmbiosDxe/PlatformSmbiosDxe.c
> b/Platform/RaspberryPi/RPi3/Drivers/PlatformSmbiosDxe/PlatformSmbiosDxe.c
> index 66ffadd0cade..540e3fd61f25 100644
> --- a/Platform/RaspberryPi/RPi3/Drivers/PlatformSmbiosDxe/PlatformSmbiosDxe.c
> +++ b/Platform/RaspberryPi/RPi3/Drivers/PlatformSmbiosDxe/PlatformSmbiosDxe.c
> @@ -863,16 +863,22 @@ MemArrMapInfoUpdateSmbiosType19 (
> )
> {
> EFI_STATUS Status;
> - UINT32 Base;
> - UINT32 Size;
> + UINT32 BoardRevision = 0;
>
> - Status = mFwProtocol->GetArmMem (&Base, &Size);
> + // Note: Type 19 addresses are expressed in KB, not bytes
> + mMemArrMapInfoType19.StartingAddress = 0;
> + // The minimum RAM size used on any Raspberry Pi model is 256 MB
> + mMemArrMapInfoType19.EndingAddress = 256 * 1024;
> + Status = mFwProtocol->GetModelRevision (&BoardRevision);
> if (Status != EFI_SUCCESS) {
> - DEBUG ((DEBUG_ERROR, "Couldn't get the ARM memory size: %r\n", Status));
> + DEBUG ((DEBUG_WARNING, "Couldn't get the board memory size - defaulting
> to 256 MB: %r\n", Status));
> } else {
> - mMemArrMapInfoType19.StartingAddress = Base / 1024;
> - mMemArrMapInfoType19.EndingAddress = (Base + Size - 1) / 1024;
> + //
> www.raspberrypi.org/documentation/hardware/raspberrypi/revision-codes/README.md
> + // Bits [20-22] indicate the amount of memory starting with 256MB (000b)
> + // and doubling in size for each value (001b = 512 MB, 010b = 1GB, etc.)
> + mMemArrMapInfoType19.EndingAddress <<= (BoardRevision >> 20) & 0x07;
> }
> + mMemArrMapInfoType19.EndingAddress -= 1;
>
> LogSmbiosData ((EFI_SMBIOS_TABLE_HEADER*)&mMemArrMapInfoType19,
> mMemArrMapInfoType19Strings, NULL);
> }
> --
> 2.21.0.windows.1
>
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