Hi Gustavo, You are right, this one almost surely explains the origin of these specific numbers in config! Thanks!
ср, 5 авг. 2020 г. в 01:07, Gustavo Henrique Nihei <ghni...@gmail.com>: > Hi Oleg, > > STM32F746 and STM32F769, although both being from the STM32F7 family, they > provide different amounts of internal SRAM. > The memory map screenshot you posted is from STM32F769. > The screenshot below was taken from the STM32F746 datasheet. As you can > see, the STM32F746 parts only provide 256KB of SRAM. > > [image: image.png] > > https://www.st.com/en/microcontrollers-microprocessors/stm32f746ng.html > > Best regards, > Gustavo. > > On Tue, Aug 4, 2020 at 5:04 PM Oleg Evseev <ev.m...@gmail.com> wrote: > >> Hi David, >> >> As I see they are used to define: >> CONFIG_RAM_END (CONFIG_RAM_START+CONFIG_RAM_SIZE) >> which in turn is used in heap allocation (up_allocateheap). >> >> By the way I am working with px4 master and custom board stm32f767 >> (software very close and based on fmu-v5). >> And I used >> CONFIG_RAM_SIZE=376832 >> CONFIG_RAM_START=0x20020000 >> but on reboots start to get random hardfaults (looking on address in log >> points to heap allocation functions) and sometimes fails advertising uorb >> topics (also heap allocation problem as I see). >> >> While I'm investigating this I notice this difference with RAM size >> config and ask this question (of course it may not be related to my issue). >> >> >> вт, 4 авг. 2020 г. в 22:49, David Sidrane <david.sidr...@nscdg.com>: >> >>> Both are not used in the source. I would assume it is a legacy C&P from >>> the F4, that should be removed. >>> >>> >>> >>> *From:* Oleg Evseev [mailto:ev.m...@gmail.com] >>> *Sent:* Tuesday, August 04, 2020 12:45 PM >>> *To:* dev@nuttx.apache.org >>> *Subject:* Re: stm32f7 CONFIG_RAM understanding >>> >>> >>> >>> No, internal memory. >>> >>> >>> >>> For all boards >>> >>> stm32f769i-disco\ >>> stm32f746-ws\ >>> stm32f746g-disco\ >>> nucleo-144\ >>> >>> >>> >>> but just found that except stm32f769i-disco, it understandably defines >>> params for SRAM1 368Kb according to MCU memory map >>> >>> CONFIG_RAM_SIZE=376832 >>> CONFIG_RAM_START=0x20020000 >>> >>> >>> >>> вт, 4 авг. 2020 г. в 22:27, Gregory Nutt <spudan...@gmail.com>: >>> >>> External SRAM? >>> >>> >>> >>> On 8/4/2020 1:08 PM, Oleg Evseev wrote: >>> >>> Hi, >>> >>> >>> >>> I wonder why stm32f7 boards has such RAM parameters in defconfigs: >>> >>> CONFIG_RAM_SIZE=245760 >>> CONFIG_RAM_START=0x20010000 >>> >>> >>> >>> Where do these numbers come from while memory map is this? >>> >>> [image: изображение.png] >>> >>> >>> >>> --- >>> >>> With regards, >>> >>> Oleg >>> >>> >>> >>> > > -- > Gustavo Henrique Nihei >
