Home/bootloader

volt.tech Latest Questions

Alex thomas
  • 0
Alex thomas
Asked: May 3, 2023In:
  • 0

Hello. Is there a way to enter bootloader/ download mode by calling a certain function in the user app? For example, I am aware of a function CODE SELECT ALL esp_restart() that will only reset the CPU and it’ll boot back to the user ...Read more

Hello.

Is there a way to enter bootloader/ download mode by calling a certain function in the user app?
For example, I am aware of a function

CODE SELECT ALL
esp_restart()

that will only reset the CPU and it’ll boot back to the user app.
But what I want is another function or a number of codes that resets the CPU and makes it so that it wouldn’t jump to the user app and rather would stay in the bootloader.
I searched, but could not discover any information on that. I tried configuring GPIO9 strapping pin as an output, writing 0 to it, and calling the esp_restart() function, but that did not work, probably because strapping pins aren’t sampled after the software reset.

Thank You

Read less
bootloadercpuesp32espressifgpio9
  1. Julian White

    Hello @Alex, Probably. Note that this register is typically intended for DWC- OTG use, and as the C3 doesn't have this, I am not sure if we tested the functionality there, but you can try the following CODE SELECT ALL (RTC_CNTL_OPTION1_REG,RTC_CNTL_FORCE_DOWNLOAD_BOOT); esp_restart(); Thank You JuliRead more

    Hello Alex thomas,

    Probably. Note that this register is typically intended for DWC- OTG use, and as the C3 doesn’t have this, I am not sure if we tested the functionality there, but you can try the following
    CODE SELECT ALL

    (RTC_CNTL_OPTION1_REG,RTC_CNTL_FORCE_DOWNLOAD_BOOT);
esp_restart();

    Thank You

    Julian White

    See less
    • 0
Anonymous
  • 0
Anonymous
Asked: July 30, 2022In:
  • 0

In a Bootloadable project, I need to access CyResetStatus but it always says CY_RESET_SW, regardless of how the chip reset. This is caused by the  the bootloader running on startup, which exits with CySoftwareReset(). This overwrites whatever was in CyResetStatus previously. Is ...Read more

In a Bootloadable project, I need to access CyResetStatus but it always says CY_RESET_SW, regardless of how the chip reset.

This is caused by the  the bootloader running on startup, which exits with CySoftwareReset(). This overwrites whatever was in CyResetStatus previously.

Is there a way for the Bootloadable project to correctly determine the reset status as seen by the Bootloader?

Or, is there a way for the bootloader to copy that information somewhere for the Bootloadable to read? For instance, how could I create a NOINIT variable in both projects that would share the same memory location?

Read less
bootableBootloadablebootloaderCY_RESET_SWCyResetStatusCySoftwareReset()mcureset status
  1. pallavi sharma
    This answer was edited.

    A global in both projects:   CY_SECTION(".reset_info") volatile struct t_reset_info reset_info; Then in the linker script of each project:   MEMORY { rom (rx) : ORIGIN = 0x0, LENGTH = 262144 ram (rwx) : ORIGIN = 0x20000000 - (65536 / 2), LENGTH = 65536 - 128 nld (rw) : ORIGIN = 0x20000000Read more

    A global in both projects:

     

    CY_SECTION(".reset_info") volatile struct t_reset_info reset_info;

    Then in the linker script of each project:

     

    MEMORY
{
	rom (rx) : ORIGIN = 0x0, LENGTH = 262144
	ram (rwx) : ORIGIN = 0x20000000 - (65536 / 2), LENGTH = 65536 - 128
    nld (rw) : ORIGIN = 0x20000000 - 128 / 2, LENGTH = 128
}

.reset_info(NOLOAD) : ALIGN(8)
{
    KEEP(*(.reset_info))
} > nld

     

     

    That way, it’s certain that the two programs will both have access to the same NOLOAD memory, and neither will corrupt it by having the memory used for anything else.

    See less
    • 0
pallavi sharma
  • 0
pallavi sharma
Asked: June 9, 2022In:
  • 0

For a project (using Renesas R7FA2L1AB2DFL), a bootloader which can update our firmware is needed. We have decided to copy this bootloader in RAM, and execute it from there since otherwise code flash memory cannot be programmed. We plan to ...Read more

For a project (using Renesas R7FA2L1AB2DFL), a bootloader which can update our firmware is needed. We have decided to copy this bootloader in RAM, and execute it from there since otherwise code flash memory cannot be programmed. We plan to access this bootloader by setting a certain random KEY in no init RAM (setting this is triggered by an external command) and then triggering a reset. Upon reset and before jumping into our application, we check for this KEY and whether it is set or not. If it is set, we can copy our bootloader from code flash to RAM, and proceed to flash the memory.

For me, it is still unclear what a good way would be to realize this process. There are a couple of points in particular

  • Where do I actually copy the bootloader from FLASH to RAM, can I do this best in the FSP system.c file?
  • How do I take preinitialized variables into account?
  • How do I manage that the linker takes into account that the bootloader is executed from SRAM (absolute vs relative addresses)?
Read less
bootloadercode flashflashfspR7FA2L1AB2DFLramrenesassystem.c
  1. dev krishnan

    The FSP flash driver will run from RAM if code flash programming is enabled in the configuration of the driver, for the parts of the flash driver driver that actually do the programming or erasing.

    The FSP flash driver will run from RAM if code flash programming is enabled in the configuration of the driver, for the parts of the flash driver driver that actually do the programming or erasing.

    See less
    • 0
Raja Singh
  • 0
Raja Singh
Asked: May 16, 2022In:
  • 0

In Bootloader my UART is not working, while I have checked that all UART register is same . I got the garbage data on UART.

In Bootloader my UART is not working, while I have checked that all UART register is same . I got the garbage data on UART.

Read less
bootloaderMUCrenesasrenesas mucuart
  1. Shivali Singh

    Hi Raja, First check if your baudrate is not changed by using SPS1 Register. If SPS1 register is not changed, then Please try to check your MCU clock first , it may be changed, Not call in systeminit function because in bootloader code, cgc_create() function already call. You can comment this cgc_crRead more

    Hi Raja,

    First check if your baudrate is not changed by using SPS1 Register. If SPS1 register is not changed, then Please try to check your MCU clock first , it may be changed, Not call in systeminit function because in bootloader code, cgc_create() function already call.

    You can comment this cgc_create() function in systeminit file, then it will work.

     

    Please feel free to write us for further support.

    Thanks & Regards

    Shivali Singh

    Application Engineer

    See less
    • 0