Hi, Since the firmware code is not open source, I am trying to find documentation I believe that raspberry pi4 firmware does a lot of things, including ddr initialisation, setting up the MMU and probably setting up the security state in EL3. Looking for some documentation which helps me understand ...

What is your aim? As standard the Pi does NOT use Uboot so is there a specific need you have for Uboot? I am working on a small microkernel which boots off uboot. if DDR init is done in uboot, I have to add less code in microkernel. DDR init is done by the Pi bootloader. This gets loaded by the fir...

Hi, Since the firmware code is not open source, I am trying to find documentation I believe that raspberry pi4 firmware does a lot of things, including ddr initialisation, setting up the MMU and probably setting up the security state in EL3. Looking for some documentation which helps me understand t...

Is there a way to enable boot log in firmware? Just for curiosity and understanding what firmware does and in what state of the system it initalizes to. For instance: - what all peripherals it has initialised = if there is some error it can display, - rather than counting the blinks of green led, it...

Hello All, I am a newbie in raspberry pi world but some background on windows desktop driver development, just got hold of a rpi4b. Read few posts and found that it is good to learn by doing everything from scratch!!! I found that there is a bootloader called uboot which is booted after power on, I...

I was able to boot 64 bit uboot from tot denx. U-MMC:   emmc2@7e340000: 0, mmcnr@7e300000: 1 Loading Environment from FAT... OK In:    serial Out:   serial Err:   serial Net:   Net Initialization Skipped No ethernet found. Hit any key to stop autoboot:  0  U-Boot> bdinfo arch_number = 0x000000000000...

Hello All, I am a newbie in raspberry pi world but some background on windows desktop driver development, just got hold of a rpi4b. Read few posts and found that it is good to learn by doing everything from scratch!!! I found that there is a bootloader called uboot which is booted after power on, I ...