StarFive Official U-boot has been configured the JTAG port. Can be found here → u-boot/starfive_visionfive2.c at JH7110_VisionFive2_devel · starfive-tech/u-boot · GitHub
Corresponding to the 40pin header, as shown in the figure below
Using the jlink to connect the chip, can refer to J-Link RISC-V - SEGGER Wiki
int InitTarget(void) {
//
// TDI -> TAP_#1 -> TAP_#0 -> TDO
//
// TAP_#0 info:
// IRLen: 5
// TAPId: 0xDEB11001
//
// TAP_#1 info:
// IRLen: 5
// TAPId: 0x20000913
//
//
// Code to connect to TAP_#1
//
JLINK_JTAG_DRPre = 1;
JLINK_JTAG_DRPost = 0;
JLINK_JTAG_IRPre = 5;
JLINK_JTAG_IRPost = 0;
JLINK_JTAG_IRLen = 5;
JLINK_JTAG_SetDeviceId(0, 0xDEB11001);
JLINK_JTAG_SetDeviceId(1, 0x20000913);
return 0;
}
Ozone with Jlink-v11 on tap1 like this:
