You might want to try:
mon reset halt
Some hardware seems to require the "halt" at the end. I am about the
furthest one can get from being an OpenOCD expert, so I couldn't tell
you what the difference is.
Chris
On Thu, Apr 19, 2018 at 03:52:39PM -0400, Niall Begley wrote:
> Hi Marko,
>
> That's extremely useful information, thank you. "Mon reset" is exactly the
> command I was looking for, although I seem to be out of luck as my board
> (HiFive1) doesn't appear to like that command:
>
> (gdb) break main
> Breakpoint 1 at 0x20000be2: file
> repos/apache-mynewt-core/apps/boot/src/boot.c, line 42.
> (gdb) mon reset
> JTAG tap: riscv.cpu tap/device found: 0x10e31913 (mfg: 0x489 (SiFive,
> Inc.), part: 0x0e31, ver: 0x1)
> halted at 0x20000418 due to debug interrupt
> Timed out waiting for state 1. Increase timeout with riscv
> set_command_timeout_sec.
> in procedure 'reset'
> in procedure 'ocd_bouncer'
>
> Even increasing the command timeout to 2 minutes doesn't help, as it just
> hangs instead:
>
> (gdb) b main
> Breakpoint 1 at 0x20000be2: file
> repos/apache-mynewt-core/apps/boot/src/boot.c, line 42.
> (gdb) mon reset
> JTAG tap: riscv.cpu tap/device found: 0x10e31913 (mfg: 0x489 (SiFive,
> Inc.), part: 0x0e31, ver: 0x1)
> halted at 0x2000041e due to debug interrupt
>
> I guess resorting to using the console with some print statements isn't the
> end of the world. I did previously try and get some printing out to a
> serial window but it wasn't working and I wasn't sure if it was just
> because the bootloader couldn't support that functionality or if I had set
> it up incorrectly. It's good to know it should work in theory so that I
> can go back and focus on implementing it correctly.
>
>
>
> On Thu, Apr 19, 2018 at 2:27 PM, marko kiiskila <ma...@runtime.io> wrote:
>
> >
> > Just reset the target; it’ll restart from the beginning.
> > Presumably the bootloader will do the same work every time it runs?
> > ‘mon reset’ is what you’d issue from gdb prompt.
> >
> > You can enable console within bootloader, if absolutely necessary.
> > Replace the console/stub package with console/full, and call sysinit()
> > from your main.
> > Note that bootloader size might increase it’s size such that you’ll need
> > to shift any subsequent data in the flash further away.
> >
> > Hope that helps,
> > M
> >
> > > On Apr 19, 2018, at 5:14 PM, Niall Begley <nbeg...@gmail.com> wrote:
> > >
> > > Hi everyone, I'm new to mynewt (and RTOS's in general) and I'm looking to
> > > do something that I think is a little outside the scope of a lot of the
> > > documentation on the mynewt site (as far as I can tell) and I was hoping
> > to
> > > get some guidance.
> > >
> > > Basically, I'm interested in modifying the existing digital signature
> > > systems in place for secure boot loading, but I'm running into a problem
> > > actually debugging the changes I'm making. When I run "newt run" on my
> > > bootloader, GDB appears to only load when the digital signature is
> > already
> > > halfway through validation. For example, here is what the stack looks
> > like
> > > immediately after breaking into GDB when the bootloader is set to perform
> > > RSA signature validation:
> > >
> > > #0 memset (dst=0x80002d28, c=c@entry=0, n=<optimized out>) at
> > > repos/apache-mynewt-core/libc/baselibc/src/memset.c:24
> > > #1 0x200025ca in mbedtls_mpi_lset (X=X@entry=0x80002fd0, z=z@entry=0)
> > at
> > > repos/apache-mynewt-core/crypto/mbedtls/src/bignum.c:295
> > > #2 0x20002f0c in mbedtls_mpi_mul_mpi (X=X@entry=0x80002fd0,
> > A=0x80002f54,
> > > A@entry=0x80002fd0, B=B@entry=0x80002f84)
> > > at repos/apache-mynewt-core/crypto/mbedtls/src/bignum.c:1193
> > > #3 0x20002f5a in mbedtls_mpi_mul_int (X=X@entry=0x80002fd0,
> > > A=A@entry=0x80002fd0,
> > > b=<optimized out>)
> > > at repos/apache-mynewt-core/crypto/mbedtls/src/bignum.c:1220
> > > #4 0x200031e4 in mbedtls_mpi_div_mpi (Q=Q@entry=0x0, R=R@entry
> > =0x80003694,
> > > A=A@entry=0x80003694, B=B@entry=0x80003cec)
> > > at repos/apache-mynewt-core/crypto/mbedtls/src/bignum.c:1388
> > > #5 0x20003320 in mbedtls_mpi_mod_mpi (R=R@entry=0x80003694,
> > > A=A@entry=0x80003694,
> > > B=B@entry=0x80003cec)
> > > at repos/apache-mynewt-core/crypto/mbedtls/src/bignum.c:1460
> > > #6 0x20003648 in mbedtls_mpi_exp_mod (X=X@entry=0x800036e4,
> > > A=A@entry=0x800036e4,
> > > E=E@entry=0x80003cf8, N=N@entry=0x80003cec,
> > > _RR=_RR@entry=0x80003d4c) at
> > > repos/apache-mynewt-core/crypto/mbedtls/src/bignum.c:1662
> > > #7 0x20003a00 in mbedtls_rsa_public (ctx=ctx@entry=0x80003ce4,
> > > input=input@entry=0x80003e2c
> > > "\002\005\256\024\350R\fV\214\207(\222\246>\016j\222t\
> > 200d2V\327\265h9F\005
> > > \305\030\312t\255\357\b\024\203\020C)Ң\f!\031\024\203\035*
> > b\220b\f!\031N\225\265\356\061F2\232\016|\024\203\035*\
> > 203\230\327\301H1\004",
> > > output=output@entry=0x80003714 "\n\001") at
> > > repos/apache-mynewt-core/crypto/mbedtls/src/rsa.c:312
> > > #8 0x20001946 in bootutil_cmp_rsasig (
> > > sig=0x80003e2c
> > > "\002\005\256\024\350R\fV\214\207(\222\246>\016j\222t\
> > 200d2V\327\265h9F\005
> > > \305\030\312t\255\357\b\024\203\020C)Ң\f!\031\024\203\035*
> > b\220b\f!\031N\225\265\356\061F2\232\016|\024\203\035*\
> > 203\230\327\301H1\004",
> > > hlen=32,
> > > hash=0x80003e0c
> > > "u\362~\202\361\245\"\206\204\370aD\241JC\304#\352\202Ҫ\247\
> > 216yA)\002\341\071wNN\002\005\256\024\350R\fV\214\207(\222\
> > 246>\016j\222t\200d2V\327\265h9F\005
> > > \305\030\312t\255\357\b\024\203\020C)Ң\f!\031\024\203\035*
> > b\220b\f!\031N\225\265\356\061F2\232\016|\024\203\035*\
> > 203\230\327\301H1\004",
> > > ctx=0x80003ce4) at repos/apache-mynewt-core/boot/
> > bootutil/src/image_rsa.c:91
> > > #9 bootutil_verify_sig (
> > > hash=hash@entry=0x80003e0c
> > > "u\362~\202\361\245\"\206\204\370aD\241JC\304#\352\202Ҫ\247\
> > 216yA)\002\341\071wNN\002\005\256\024\350R\fV\214\207(\222\
> > 246>\016j\222t\200d2V\327\265h9F\005
> > > \305\030\312t\255\357\b\024\203\020C)Ң\f!\031\024\203\035*
> > b\220b\f!\031N\225\265\356\061F2\232\016|\024\203\035*\
> > 203\230\327\301H1\004",
> > > hlen=hlen@entry=32,
> > > sig=sig@entry=0x80003e2c
> > > "\002\005\256\024\350R\fV\214\207(\222\246>\016j\222t\
> > 200d2V\327\265h9F\005
> > > \305\030\312t\255\357\b\024\203\020C)Ң\f!\031\024\203\035*
> > b\220b\f!\031N\225\265\356\061F2\232\016|\024\203\035*\
> > 203\230\327\301H1\004",
> > > slen=slen@entry=256, key_id=<optimized out>) at
> > > repos/apache-mynewt-core/boot/bootutil/src/image_rsa.c:145
> > > #10 0x20001842 in bootutil_img_validate (hdr=hdr@entry=0x800007c4
> > > <boot_data>, fap=fap@entry=0x20005e84 <sysflash_map_dflt+12>,
> > > tmp_buf=<optimized out>, tmp_buf_sz=tmp_buf_sz@entry=256,
> > > seed=seed@entry=0x0, seed_len=seed_len@entry=0,
> > > out_hash=out_hash@entry=0x0) at
> > > repos/apache-mynewt-core/boot/bootutil/src/image_validate.c:215
> > > #11 0x20000e2e in boot_image_check (fap=0x20005e84
> > <sysflash_map_dflt+12>,
> > > hdr=0x800007c4 <boot_data>)
> > > at repos/apache-mynewt-core/boot/bootutil/src/loader.c:518
> > > #12 boot_validate_slot (slot=slot@entry=0) at
> > > repos/apache-mynewt-core/boot/bootutil/src/loader.c:576
> > > #13 0x200011b4 in boot_go (rsp=rsp@entry=0x80003fd4) at
> > > repos/apache-mynewt-core/boot/bootutil/src/loader.c:1054
> > > #14 0x20000bf2 in main () at
> > > repos/apache-mynewt-core/apps/boot/src/boot.c:54
> > >
> > > Is there a better way to do this with GDB? Is it possible to use one of
> > > the logging or console packages to perform prints? Any tips in general?
> > >
> > > Thanks everyone
> >
> >
