Hello,
I am trying to enable the TPM 2.0 SLB9670 in U-Boot for a Raspberry Pi 3 B+.
More precisely, the TPM is on an add-on board, the IRIDIUM SLB9670.
The communication between the RPI and the TPM is ensured by SPI so I enabled
the software spi driver (spi-gpio) in U-Boot because the bcm28x spi driver is
not available in U-Boot.
CONFIG_SPI=y
CONFIG_DM_SPI=y
CONFIG_SOFT_SPI=y
Then, I enabled the TPM support in U-Boot.
CONFIG_CMD_TPM_V2=y
CONFIG_CMD_TPM=y
CONFIG_TPM_V2=y
CONFIG_TPM2_TIS_SPI=y
CONFIG_TPM=y
Finally, I updated my Device Tree.
/dts-v1/
/ {
...
aliases {
spi0 = &soft_spi;
};
soft_spi: soft-spi {
compatible = "spi-gpio";
pinctrl-names = "default";
pinctrl-0 = <&spi0_gpio7>;
status = "okay";
gpio-sck = <&gpio 11 0>;
gpio-mosi = <&gpio 10 0>;
gpio-miso = <&gpio 9 0>;
cs-gpios = <&gpio 7 1>;
#address-cells = <1>;
#size-cells = <0>;
slb9670: slb9670@0 {
compatible = "tis,tpm2-spi";
reg = <1>;
#address-cells = <1>;
#size-cells = <0>;
spi-max-frequency = <32000000>;
status = "okay";
};
};
spio0_gpio7: spio0_gpio7 {
brcm,pins = <7 8 9 10 11>;
brcm,function = <4>;
};
...
};
But, when I try to execute the following command :
U-Boot> tpm2 init
I have the following response :
tpm_tis_spi_probe : missing reset GPIO
tpm_tis_spi_request_locality : Timeout getting locality : -2
tpm_tis_spi_probe : could not request locality 0
Could not find TPM (ret=-2)
The Iridium board contains a reset circuit on board, which pulls the reset line
of the TPM to GND after VCC becomes available, so the reset GPIO is not needed
I think.
I don’t see what is wrong with my setup, a little help would be very
appreciated.
Thank you in advance,
Elena
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