While trying to create the documentation to semihosting syslog I disabled the STM32 USART2 driver to avoid the system using the up_putc() from stm32_serial.c.
But the arch/arm/src/stm32/Make.defs it adding many source files even when the peripheral is not enabled: CHIP_CSRCS = stm32_allocateheap.c stm32_start.c stm32_rcc.c stm32_lse.c CHIP_CSRCS += stm32_lsi.c stm32_gpio.c stm32_exti_gpio.c stm32_flash.c CHIP_CSRCS += stm32_irq.c stm32_lowputc.c CHIP_CSRCS += stm32_serial.c stm32_spi.c stm32_i2s.c stm32_sdio.c stm32_tim.c CHIP_CSRCS += stm32_waste.c stm32_ccm.c stm32_uid.c stm32_capture.c CHIP_CSRCS += stm32_dfumode.c The stm32_serial.c only should be compiled when CONFIG_STM32_USART is enabled. I submitted a PR to fix it and the up_nputs() issue and Lwazi commented before: https://github.com/apache/nuttx/pull/17187 BR, Alan On Fri, Oct 10, 2025 at 9:49 AM Jean Thomas <j...@lambdaconcept.com> wrote: > Hi Lwazi, > > I've got semihosting syslog working, thanks to your precious insight. > > I had to add this into my defconfig: > - CONFIG_ARM_SEMIHOSTING_SYSLOG=y > - CONFIG_DEV_CONSOLE=n > - CONFIG_SYSLOG_DEFAULT=y > > And remove: > - CONFIG_UART0_SERIAL_CONSOLE=y > > I also had to enclose up_putc in rp2040_serial.c like you did in > uart_16550, and also modified arm_lowputc to direct output to up_putc. > > Best regards, > Jean. > > > On 9 Oct 2025, at 22:45, Lwazi Dube <lwa...@gmail.com> wrote: > > > > I just tried this on an am335x board (armv7a) and got some logs after the > > gdb prompt. > > > > 1) I am using openocd 0.12.0 > > > > 2) The board's uart driver is uart_16550. I exclude (16550) up_putc so > that > > the other one in "arm_semi_syslog.c" is used. > > > > #ifndef CONFIG_ARM_SEMIHOSTING_SYSLOG <----- > > #ifdef HAVE_16550_CONSOLE > > void up_putc(int ch) > > { > > FAR struct u16550_s *priv = (FAR struct u16550_s *)CONSOLE_DEV.priv; > > > > u16550_putc(priv, ch); > > } > > #endif > > #endif > > > > 3) Fix multiple definition error in "arm_nputs.c" ... > > > > #ifndef CONFIG_ARM_SEMIHOSTING_SYSLOG <---- > > void up_nputs(const char *str, size_t len) > > { > > while (len-- > 0 && *str) > > { > > up_putc(*str++); > > } > > } > > #endif > > > > 4) > > [*] Enable Debug Features > > *** Debug SYSLOG Output Controls *** > > [*] Enable Error Output > > [*] Enable Warnings Output > > [*] Enable Informational Debug Output > > > > [*] Memory Manager Debug Features > > [*] Memory Manager Error Output > > [*] Memory Manager Warnings Output > > [*] Memory Manager Informational Output > > > > 5) Load and run using gdb > > > > adapter speed: 16000 kHz > > core state: ARM > > semihosting is enabled > > semihosting fileio is enabled > > (gdb) load > > Loading section .text, size 0x205c4 lma 0x8a000000 > > Loading section .ARM.exidx, size 0x8 lma 0x8a0205c4 > > Loading section .data, size 0x394 lma 0x8a0205cc > > Start address 0x8a0002e0, load size 133472 > > Transfer rate: 210 KB/sec, 12133 bytes/write. > > (gdb) c > > Continuing. > > mm_initialize: Heap: name=Umem, start=0x8a0229e4 size=368956956 > > mm_addregion: Region 1: base=0x8a022b44 size=368956600 > > mm_malloc: Allocated 0x8a022b58, size 72 > > mm_malloc: Allocated 0x8a022ba0, size 40 > > mm_malloc: Allocated 0x8a022bc8, size 48 > > mm_malloc: Allocated 0x8a022bf8, size 48 > > mm_malloc: Allocated 0x8a022c28, size 48 > > mm_malloc: Allocated 0x8a022c58, size 48 > > mm_malloc: Allocated 0x8a022c88, size 48 > > mm_malloc: Allocated 0x8a022cb8, size 48 > > mm_malloc: Allocated 0x8a022ce8, size 1000 > > mm_malloc: Allocated 0x8a0230d0, size 2056 > > > > Program stopped. > > _vector_start () at armv7-a/arm_vectortab.S:68 > > 68 ldr pc, .Lsvchandler /* 0x08: > > Software interrupt */ > > (gdb) > > > > > > On Wed, 8 Oct 2025 at 14:00, Adam Feuer <a...@starcat.io> wrote: > > > >> Thanks Jean and Alan. At work right now, and I also don't remember > exactly > >> what I did for that– I'll need to reply privately. > >> > >> Yes, Alan, if I do remember what I did I would be grateful if you did > >> update the docs. > >> > >> -adam > >> > >> On Wed, Oct 8, 2025 at 10:06 AM Alan C. Assis <acas...@gmail.com> > wrote: > >> > >>> Hi Jean, > >>> > >>> Looking at boards/ seems like the semihost for file system is the most > >>> common usage, but yes there is one and only one board with SEMIHOST > >> SYSLOG > >>> support, that you found. > >>> > >>> According to git blame this support was added by Adam Feuer (CC here), > >> but > >>> there is no Documentation/ about it. > >>> > >>> Adam, do you remember how to test it? If you can share details here I > >> will > >>> expand the semihost documentation to include syslog support. > >>> > >>> BR, > >>> > >>> Alan > >>> > >>> On Wed, Oct 8, 2025 at 1:41 PM Jean Thomas <j...@lambdaconcept.com> > >> wrote: > >>> > >>>> Hi everyone, > >>>> > >>>> I've been trying to get ARM semihosting syslog working on a RP2040 > board > >>>> for a little while (debugged using Pi's debugprobe). I added this into > >> my > >>>> defconfig: > >>>> > >>>> CONFIG_ARM_SEMIHOSTING_SYSLOG=y > >>>> CONFIG_SYSLOG_CHARDEV=y > >>>> > >>>> (inspired by sama5d3-xplained's ethernet-over-usb-2-high-speed > >> defconfig) > >>>> > >>>> and this in my OpenOCD script: > >>>> > >>>> monitor arm semihosting enable > >>>> monitor arm semihosting_fileio enable > >>>> > >>>> Syslog disappears from the UART console, but doesn't appear in > >> OpenOCD... > >>>> Am I doing something wrong? Does someone have an example of a working > >>>> syslog over ARM semihosting example? Is there an easy way to debug > >> what's > >>>> going on? > >>>> > >>>> Cheers, > >>>> Jean > >>> > >>> > >> > >> -- > >> Adam Feuer <a...@starcat.io> > >> > >
