About geirlandunico

geirlandunico · 2024-10-30

Hi all,My goal is to have position independent binaries for my application (on an STM32H7) so that I can update the device while running out of flash (swapping between two different program locations).I followed this tutorial: https://techblog.paalij...

geirlandunico · 2024-10-17

Hi all, I put together a custom bootloader for my application (to allow the program to update itself). The bootloader itself is incredibly simple. It just reads from a known location in flash to determine which address to load from and then attempt...

geirlandunico · 2024-09-03

Hi all, We have an STM32H735VGH6 on a custom board with a LAN8742a PHY chip to allow ethernet communication. This custom board is minimally tested so it's possible that there's a hardware issue though I'm uncertain where the issue would be. I gener...

geirlandunico · 2024-08-27

I have a STM32H7 with it's FMC signals hooked up to an FPGA in order to allow the microcontroller to peak/poke into FPGA registers. I had a FIFO in this address space that, if read, would automatically increment to the next value. I was noticing on...

geirlandunico · 2024-10-30

So then you'd advise leaving it as it is (fpic working for variables and most function calls) but then manually patching the bin files to update those specific .data.rel portions?

geirlandunico · 2024-10-18

Ah I got it! I was continuously calling the 0x80C0004 location as an instruction instead of properly calling the reference of that address. I needed to do replace line 53 in that function as so: //appl_ptr = (void (*)())(load_addr + 4); appl_ptr = (...

geirlandunico · 2024-10-18

Shouldn't the bootloader code I posted be disabling all IRQs? I'm not only running __disable_irq(), I'm also setting: HAL_RCC_DeInit(); HAL_DeInit(); SysTick->CTRL = 0; SysTick->LOAD = 0; SysTick->VAL = 0; __HAL_RCC_SYSCFG_CLK_ENABLE();a...

geirlandunico · 2024-10-17

I did try to follow along with the debugger but stepping into the application pointer just immediately hardfaults too. I'm not sure if that's just because I have the STM32 IDE inproperly setup or if it's truly failing on the initial jump itself. Wh...

geirlandunico · 2024-10-17

Ah I see my bad on the understanding of the value at 0x80C0004. Looking at the data grabbed in that KeilHardFault example:The msp is 0x24050000 so I'm assuming the sp being 2404ffe0 in the hardfault handler is due to dumping the register info onto th...

User statistics

User Activity

Position Independent Code Hardfaults With Function Pointers

When using a custom bootloader, application hard faults

Ethernet/LwIP On Custom Board Issue With D-Cache

FMC Read Duplicates During Interrupt But Writes Seemingly Don't

Re: Position Independent Code Hardfaults With Function Pointers

Re: When using a custom bootloader, application hard faults

Re: When using a custom bootloader, application hard faults

Re: When using a custom bootloader, application hard faults

Re: When using a custom bootloader, application hard faults