Alan, The same change works with stlink on f7. Please test with minimal changes. See my diff and gdb log below.
(gdb) mon reset halt Info : Unable to match requested speed 2000 kHz, using 1800 kHz Unable to match requested speed 2000 kHz, using 1800 kHz Info : Unable to match requested speed 2000 kHz, using 1800 kHz Unable to match requested speed 2000 kHz, using 1800 kHz [stm32f7x.cpu] halted due to debug-request, current mode: Thread xPSR: 0x01000000 pc: 0x080003c4 msp: 0x20011b68 [stm32f7x.cpu] halted due to debug-request, current mode: Thread xPSR: 0x01000000 pc: 0x080003c4 msp: 0x20011b68 (gdb) monitor arm semihosting enable semihosting is enabled (gdb) monitor arm semihosting_fileio enable semihosting fileio is enabled (gdb) c Continuing. mm_initialize: Heap: name=Umem, start=0x20011b68 size=238744 mm_addregion: Region 1: base=0x20011cd8 size=238376 mm_malloc: Allocated 0x20011ce8, size 72 mm_malloc: Allocated 0x20011d30, size 40 mm_addregion: Region 2: base=0x2004c000 size=16384 mm_addre^C[stm32f7x.cpu] halted due to debug-request, current mode: Thread xPSR: 0x21000000 pc: 0x0800c94a msp: 0x200118f0, semihosting fileio diff --git a/arch/arm/src/common/arm_nputs.c b/arch/arm/src/common/arm_nputs.c index 6ec271db77..1f3a22dd05 100644 --- a/arch/arm/src/common/arm_nputs.c +++ b/arch/arm/src/common/arm_nputs.c @@ -38,7 +38,7 @@ * This is a low-level helper function used to support debug. * ****************************************************************************/ - +#ifndef CONFIG_ARM_SEMIHOSTING_SYSLOG void up_nputs(const char *str, size_t len) { while (len-- > 0 && *str) @@ -46,3 +46,4 @@ void up_nputs(const char *str, size_t len) up_putc(*str++); } } +#endif diff --git a/arch/arm/src/stm32f7/stm32_serial.c b/arch/arm/src/stm32f7/stm32_serial.c index aebcd705fb..a977aee0e4 100644 --- a/arch/arm/src/stm32f7/stm32_serial.c +++ b/arch/arm/src/stm32f7/stm32_serial.c @@ -3803,6 +3803,7 @@ void stm32_serial_dma_poll(void) * ****************************************************************************/ +#ifndef CONFIG_ARM_SEMIHOSTING_SYSLOG void up_putc(int ch) { #if CONSOLE_UART > 0 @@ -3814,6 +3815,7 @@ void up_putc(int ch) up_restoreusartint(priv, ie); #endif } +#endif #else /* USE_SERIALDRIVER */ diff --git a/boards/arm/stm32f7/stm32f746g-disco/configs/nsh/defconfig b/boards/arm/stm32f7/stm32f746g-disco/configs/nsh/defconfig index c0f15c1e90..9a7e64bed3 100644 --- a/boards/arm/stm32f7/stm32f746g-disco/configs/nsh/defconfig +++ b/boards/arm/stm32f7/stm32f746g-disco/configs/nsh/defconfig @@ -21,8 +21,14 @@ CONFIG_ARMV7M_DCACHE=y CONFIG_ARMV7M_DCACHE_WRITETHROUGH=y CONFIG_ARMV7M_DTCM=y CONFIG_ARMV7M_ICACHE=y +CONFIG_ARM_SEMIHOSTING_SYSLOG=y CONFIG_BOARD_LOOPSPERMSEC=43103 CONFIG_BUILTIN=y +CONFIG_DEBUG_FEATURES=y +CONFIG_DEBUG_MM=y +CONFIG_DEBUG_MM_ERROR=y +CONFIG_DEBUG_MM_INFO=y +CONFIG_DEBUG_MM_WARN=y CONFIG_DEBUG_SYMBOLS=y CONFIG_HAVE_CXX=y CONFIG_HAVE_CXXINITIALIZE=y On Mon, 13 Oct 2025 at 08:34, Alan C. Assis <acas...@gmail.com> wrote: > Jean, > > Maybe the issue is related to stlink support on OpenOCD, maybe we need to > use another programmer better compatible with ARM DAP. > > What programmer are you using with OpenOCD? > > BR, > > Alan > > On Mon, Oct 13, 2025 at 9:24 AM Alan C. Assis <acas...@gmail.com> wrote: > > > Hi Jean, > > > > Thank you for the suggestion. In fact CONFIG_SYSLOG_DEFAULT is enabled, > > but it is not displayed in the defconfig because it is enabled by > default, > > so the savedefconfig compression doesn't include it. > > > > BR, > > > > Alan > > > > On Mon, Oct 13, 2025 at 5:56 AM Jean Thomas <j...@lambdaconcept.com> > > wrote: > > > >> Hi Alan, > >> > >> > Could you please double check my defconfig for stm32f4discovery (a > >> create a > >> > config using the nsh as base removing USART support and enabling > >> > SEMIHOSTING SYSLOG): > >> > >> I don't see CONFIG_SYSLOG_DEFAULT=y in there. > >> > >> Also, can you try to bump CONFIG_SYSLOG_MAX_CHANNELS to a higher value > >> than 1 (default)? Syslog is seemingly dynamically registered, so if > there's > >> not enough room for it, it won't work — I fell into this pitfall the > other > >> day :) > >> > >> Cheers, > >> Jean > >> > >> > >> >