OpenOCD

Building OpenOCD

1. Get the patched version of RISC-V OpenOCD
2. Select the correct branch depending on the RISC-V core

   Core	Branch	Note
   SweRV	riscv-tapasco-swerv	System bus access is disabled.
   SCR1	riscv-tapasco-scr1-no-bursts	Write and read bursts are disabled.
   SCR1	riscv-tapasco-scr1-write-bursts	Only read bursts are disabled.
   CVA6	riscv-tapasco-cva6	Patched write bursts as in riscv-tapasco-scr1-write-bursts and replaced read bursts of length=n with n bursts of length=1.
   SCR1	riscv-tapasco-cva6	The CVA6 branch seems to work for SCR1 too.
   Default	riscv-tapasco

3. Compile C Cap'n Proto
   • git clone https://github.com/opensourcerouting/c-capnproto
   • cd c-capnproto
   • git submodule update --init --recursive
   • autoreconf -f -i -s
   • ./configure
   • make
   • cd ..
4. Move library c-capnproto/.libs/libcapnp_c.la into riscv-openocd/src/jtag/drivers/
5. Move library c-capnproto/.libs/libcapnp_c.so into riscv-openocd/src/jtag/drivers/.libs/ (new directory)
6. Build OpenOCD with:
   • ./bootstrap
   • ./configure --enable-tapascojtag
   • make
   • make install (requires root permissions, otherwise directly use src/openocd as the binary)