% brew --version
Homebrew 5.0.7

-I/opt/homebrew/Cellar/hidapi/0.15.0/include/hidapi -Wall -Wstrict-prototypes -Wformat-security -Wshadow -Wextra -Wno-unused-parameter -Wbad-function-cast -Wcast-align -Wredundant-decls -Wpointer-arith -Wundef -Werror -g -O2 -MT src/jtag/drivers/libocdjtagdrivers_la-amt_jtagaccel.lo -MD -MP -MF src/jtag/drivers/.deps/libocdjtagdrivers_la-amt_jtagaccel.Tpo -c src/jtag/drivers/amt_jtagaccel.c -o src/jtag/drivers/libocdjtagdrivers_la-amt_jtagaccel.o
src/jtag/drivers/amt_jtagaccel.c:16:10: fatal error: 'linux/parport.h' file not found
   16 | #include <linux/parport.h>
      |          ^~~~~~~~~~~~~~~~~
1 error generated.
make[2]: *** [src/jtag/drivers/libocdjtagdrivers_la-amt_jtagaccel.lo] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2

% ./configure --disable-amtjtagaccel

 % ./src/openocd -d4 -c "set USE_CORE rv0" -s ./tcl -f tcl/interface/cmsis-dap.cfg -f tcl/target/rp2350.cfg
 
 (中略)
 
 Debug: 33 7 command.c:86 script_debug(): command - ocd_find target/swj-dp.tcl
 Debug: 34 7 configuration.c:88 find_file(): found ./tcl/target/swj-dp.tcl
 Debug: 35 7 command.c:86 script_debug(): command - transport select
 Debug: 36 7 command.c:86 script_debug(): command - transport select
 Debug: 37 7 command.c:86 script_debug(): command - transport select
Debug: 38 7 command.c:86 script_debug(): command - swd newdap rp2350 cpu -expected-id 0x00040927
Debug: 39 7 tcl.c:405 handle_jtag_newtap_args(): Creating New Tap, Chip: rp2350, Tap: cpu, Dotted: rp2350.cpu, 2 params
Debug: 40 7 core.c:1491 jtag_tap_init(): Created Tap: rp2350.cpu @ abs position 0, irlen 0, capture: 0x1 mask: 0x3
Debug: 41 7 command.c:86 script_debug(): command - dap create rp2350.dap -adiv6 -chain-position rp2350.cpu
Debug: 42 7 command.c:86 script_debug(): command - target create rp2350.rv0 riscv -dap rp2350.dap -ap-num 0xa000 -coreid 0
Debug: 43 8 command.c:462 exec_command(): Command 'target create' failed with error code -603
User : 44 8 command.c:534 command_run_line(): Unknown param: -dap, try one of: -type, -event, -work-area-virt, -work-area-phys, -work-area-size, -work-area-backup, -endian, -coreid, -chain-position, -dbgbase, -rtos, -defer-examine, -gdb-port, or -gdb-max-connections

 depbase=`echo src/target/riscv/batch.lo | sed 's|[^/]*$|.deps/&|;s|\.lo$||'`;\
         /bin/sh ./libtool  --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I.   -I./src -I./src -DPKGDATADIR=\"/usr/local/share/openocd\" -DBINDIR=\"/usr/local/bin\"  -I/opt/homebrew/Cellar/jimtcl/0.83/include  -Wall -Wstrict-prototypes -Wformat-security -Wshadow -Wextra -Wno-unused-parameter -Wbad-function-cast -Wcast-align -Wredundant-decls -Wpointer-arith -Wundef -Werror  -g -O2 -MT src/target/riscv/batch.lo -MD -MP -MF $depbase.Tpo -c -o src/target/riscv/batch.lo src/target/riscv/batch.c &&\
         mv -f $depbase.Tpo $depbase.Plo
 libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I./src -I./src -DPKGDATADIR=\"/usr/local/share/openocd\" -DBINDIR=\"/usr/local/bin\" -I/opt/homebrew/Cellar/jimtcl/0.83/include -Wall -Wstrict-prototypes -Wformat-security -Wshadow -Wextra -Wno-unused-parameter -Wbad-function-cast -Wcast-align -Wredundant-decls -Wpointer-arith -Wundef -Werror -g -O2 -MT src/target/riscv/batch.lo -MD -MP -MF src/target/riscv/.deps/batch.Tpo -c src/target/riscv/batch.c -o src/target/riscv/batch.o
 src/target/riscv/batch.c:194:24: error: cast from 'uint8_t *' (aka 'unsigned char *') to 'uint32_t *' (aka 'unsigned int *') increases required alignment from 1 to 4 [-Werror,-Wcast-align]
   194 |                         uint32_t *data_in = (uint32_t*)batch->data_in;
       |                                             ^~~~~~~~~~~~~~~~~~~~~~~~~
 src/target/riscv/batch.c:243:13: error: incompatible pointer types initializing 'uint32_t *' (aka 'unsigned int *') with an expression of type 'uint8_t *const' (aka 'unsigned char *const') [-Werror,-Wincompatible-pointer-types]
   243 |                 uint32_t *data_in = batch->data_in;
      |                           ^         ~~~~~~~~~~~~~~
2 errors generated.
make[2]: *** [src/target/riscv/batch.lo] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2

                         uint32_t data_in;
                         uint8_t  *dst = batch->data_in + (batch->used_scans * sizeof(uint32_t));
                         if (batch->ap) {
                                 printf("batch->ap true.\n");
                                 uint32_t dmi_addr = 4 * riscv_get_dmi_address(batch->target, address);
                                 batch->queued_retval = mem_ap_read_u32(batch->ap, dmi_addr, &data_in);
                         } else {
                                 printf("batch->ap false.\n");
                                 uint32_t dmi_addr = riscv_get_dmi_address(batch->target, address);
                                batch->queued_retval = riscv_dmi_read(batch->target,
                                                                                   &data_in, dmi_addr);
                        }
                       memcpy(dst, &data_in, sizeof(uint32_t));

checking for the correct version of gmp.h... no
configure: error: Building GDB requires GMP 4.2+, and MPFR 3.1.0+.
Try the --with-gmp and/or --with-mpfr options to specify
their locations.  If you obtained GMP and/or MPFR from a vendor
distribution package, make sure that you have installed both the libraries
and the header files.  They may be located in separate packages.
make: *** [Makefile:631: stamps/build-gdb-newlib] Error 1

 stamps/build-gdb-newlib: $(GDB_SRCDIR) $(GDB_SRC_GIT) $(PREPARATION_STAMP)
         rm -rf $@ $(notdir $@)
         mkdir $(notdir $@)
 # CC_FOR_TARGET is required for the ld testsuite.
         cd $(notdir $@) && CC_FOR_TARGET=$(NEWLIB_CC_FOR_TARGET) $</configure \
                 --target=$(NEWLIB_TUPLE) \
                 $(CONFIGURE_HOST) \
                 --prefix=$(INSTALL_DIR) \
                  \
                --disable-werror \
                $(GDB_TARGET_FLAGS) \
                --enable-gdb \
                --disable-gas \
                --disable-binutils \
                --disable-ld \
                --disable-gold \
                --with-gmp=/opt/homebrew/ \
                --with-mpfr=/opt/homebrew/ \
                --disable-gprof
        $(MAKE) -C $(notdir $@)
        $(MAKE) -C $(notdir $@) $(INSTALL_TARGET)
        mkdir -p $(dir $@) && touch $@

Example: ```GCC_EXTRA_CONFIGURE_FLAGS=--with-gmp=/opt/gmp make linux```

 Debug: 210 43 target.c:726 target_examine_one(): [rp2350.rv1] Examination started
 Debug: 211 43 target.c:1828 target_call_event_callbacks(): target event 19 (examine-start) for core rp2350.rv1
 Debug: 212 43 riscv.c:1733 riscv_examine(): [rp2350.rv1] Starting examination
 Debug: 213 43 riscv-013.c:2854 init_target(): [rp2350.rv1] Init.
 Debug: 214 43 riscv-013.c:1990 examine(): [rp2350.rv1] dbgbase=0x0
 Debug: 215 43 riscv-013.c:859 check_dbgbase_exists(): [rp2350.rv1] Searching for DM with DMI base address (dbgbase) = 0x0
 Debug: 216 43 riscv-013.c:5505 riscv013_invalidate_cached_progbuf(): [rp2350.rv1] Invalidating progbuf cache
 Debug: 217 44 riscv-013.c:2058 examine(): [rp2350.rv1] dmstatus:  0x004030a2
 Debug: 218 44 riscv-013.c:2074 examine(): [rp2350.rv1] hartsellen=1
Info : 219 45 riscv-013.c:2102 examine(): [rp2350.rv1] datacount=1 progbufsize=2
Info : 220 46 riscv-013.c:2159 examine(): [rp2350.rv1] unavailable.
Error: 221 46 target.c:732 target_examine_one(): [rp2350.rv1] Examination failed
Debug: 222 46 target.c:733 target_examine_one(): [rp2350.rv1] examine() returned error code -4
Debug: 223 46 target.c:1828 target_call_event_callbacks(): target event 20 (examine-fail) for core rp2350.rv1
Warn : 224 46 target.c:781 target_examine(): target rp2350.rv1 examination failed

target remote localhost:3333
set {int}0x40120158 = 0x3
monitor reset

 % ./src/openocd  -c "adapter speed 5000" -s ./tcl -f tcl/interface/cmsis-dap.cfg -f tcl/target/rp2350-riscv.cfg
 /Library/Developer/CommandLineTools/usr/bin/make  all-recursive
 Making all in testing
 Making all in tcl_commands
 make[3]: Nothing to be done for `all'.
 make[3]: Nothing to be done for `all-am'.
 make[2]: Nothing to be done for `all-am'.
 Open On-Chip Debugger 0.12.0+dev-00002-gcd4873400 (2025-12-27-22:18)
 Licensed under GNU GPL v2
For bug reports, read
        http://openocd.org/doc/doxygen/bugs.html
adapter speed: 5000 kHz
Info : [rp2350.rv0] Hardware thread awareness created
Info : [rp2350.rv1] Hardware thread awareness created
ocd_process_reset_inner
Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections
Info : Using CMSIS-DAPv2 interface with VID:PID=0x2e8a:0x000c, serial=E6647C74036C1832
Warn : ***
Warn : *** Old Raspberry Pi Debugprobe firmware detected (1.0.1)
Warn : *** Using low-performance workaround
Warn : *** Please update to the latest release at:
Warn : *** https://github.com/raspberrypi/debugprobe/releases/latest
Warn : ***
Info : CMSIS-DAP: SWD supported
Info : CMSIS-DAP: Atomic commands supported
Info : CMSIS-DAP: Test domain timer supported
Info : CMSIS-DAP: FW Version = 2.0.0
Info : CMSIS-DAP: Interface Initialised (SWD)
Info : SWCLK/TCK = 0 SWDIO/TMS = 0 TDI = 0 TDO = 0 nTRST = 0 nRESET = 0
Info : CMSIS-DAP: Interface ready
Info : clock speed 5000 kHz
Info : SWD DPIDR 0x4c013477 DPv3
Info : [rp2350.rv0] datacount=1 progbufsize=2
Info : [rp2350.rv0] Disabling abstract command reads from CSRs.
Info : [rp2350.rv0] Disabling abstract command writes to CSRs.
Info : [rp2350.rv0] Core 0 could not be made part of halt group 1.
Info : [rp2350.rv0] Examined RISC-V core
Info : [rp2350.rv0]  XLEN=32, misa=0x40901105
Info : [rp2350.rv0] Examination succeed
Info : [rp2350.rv1] datacount=1 progbufsize=2
Info : [rp2350.rv1] Disabling abstract command reads from CSRs.
Info : [rp2350.rv1] Disabling abstract command writes to CSRs.
Info : [rp2350.rv1] Core 1 could not be made part of halt group 1.
Info : [rp2350.rv1] Examined RISC-V core
Info : [rp2350.rv1]  XLEN=32, misa=0x40901105
Info : [rp2350.rv1] Examination succeed
Info : [rp2350.rv0] starting gdb server on 3333
Info : Listening on port 3333 for gdb connections
…

gdb側はこんな感じ。

```sh
(gdb) target remote localhost:3333
A program is being debugged already.  Kill it? (y or n) y
Remote connection closed
(gdb) target remote localhost:3333
Remote debugging using localhost:3333
warning: No executable has been specified and target does not support
determining executable automatically.  Try using the "file" command.

Thread 1 "rp2350.rv0" received signal SIGTRAP, Trace/breakpoint trap.
0x100478bc in ?? ()
(gdb) info all-registers
zero           0x0  0
ra             0x2001041c   0x2001041c
sp             0x20010400   0x20010400
gp             0x200071e0   0x200071e0
tp             0x0  0x0
t0             0x80000102   -2147483390