Hello everyone,
we have the following problem:
When we boot linux without loading a m4 binary in u-boot, both flexcan's are working fine from linux with socketcan.
However, as soon as we load a binary for the m4, the flexcan's do not show up when calling 'ip link'.
It seems as the call to flexcan_chip_enable in flexcan.c is failing, more specifically the clearing of bit MCR_MDIS
and the subsequent polling of MCR_LPM_ACK seems to not produce the expected result.
It seems to be not the software on the m4, as replacing the binary with a all-zero binary still gives the same problem.
The relevent parts in our device-tree might be the following:
#include "imx6sx-customboard.dtsi"
/ {
model = "customboard";
};
//
// SNIP
//
&flexcan1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_flexcan1>;
xceiver-supply = <®_can0_stb>;
status = "okay";
};
&flexcan2 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_flexcan2>;
xceiver-supply = <®_can2_stb>;
status = "okay";
};
&clks {
fsl,shared-clks-number = <0x23>;
fsl,shared-clks-index = <IMX6SX_CLK_PLL2_BUS IMX6SX_CLK_PLL2_PFD0
IMX6SX_CLK_PLL2_PFD2 IMX6SX_CLK_PLL3_USB_OTG
IMX6SX_CLK_PLL3_PFD1 IMX6SX_CLK_PLL3_PFD2
IMX6SX_CLK_PLL3_PFD3 IMX6SX_CLK_PLL4_AUDIO
IMX6SX_CLK_PLL5_VIDEO
IMX6SX_CLK_OCRAM IMX6SX_CLK_CAN1_SERIAL
IMX6SX_CLK_CAN1_IPG IMX6SX_CLK_CAN2_SERIAL
IMX6SX_CLK_CAN2_IPG IMX6SX_CLK_CANFD
IMX6SX_CLK_ECSPI1 IMX6SX_CLK_ECSPI2
IMX6SX_CLK_ECSPI3 IMX6SX_CLK_ECSPI4
IMX6SX_CLK_ECSPI5 IMX6SX_CLK_QSPI1
IMX6SX_CLK_QSPI2 IMX6SX_CLK_SSI1
IMX6SX_CLK_SSI2 IMX6SX_CLK_SSI3
IMX6SX_CLK_UART_SERIAL IMX6SX_CLK_UART_IPG
IMX6SX_CLK_PERIPH_CLK2_SEL IMX6SX_CLK_DUMMY
IMX6SX_CLK_I2C1 IMX6SX_CLK_I2C2
IMX6SX_CLK_I2C3 IMX6SX_CLK_I2C4
IMX6SX_CLK_EPIT1 IMX6SX_CLK_EPIT2>;
fsl,shared-mem-addr = <0x91F000>;
fsl,shared-mem-size = <0x1000>;
};
Do you have a suggestion on what is going wrong here?
Thank you very much,
Maik
