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by rpinewbie01
Fri Sep 20, 2019 11:52 am
Forum: Bare metal, Assembly language
Topic: Raspberry Pi4 firmware questions
Replies: 3
Views: 1251

Re: Raspberry Pi4 firmware questions

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 ...
by rpinewbie01
Fri Sep 20, 2019 8:39 am
Forum: Troubleshooting
Topic: u-boot port on RaspberryPi 4
Replies: 21
Views: 3398

Re: u-boot port on RaspberryPi 4

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...
by rpinewbie01
Fri Sep 20, 2019 8:37 am
Forum: Bare metal, Assembly language
Topic: Raspberry Pi4 firmware questions
Replies: 3
Views: 1251

Raspberry Pi4 firmware questions

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...
by rpinewbie01
Thu Sep 19, 2019 2:55 pm
Forum: Advanced users
Topic: Is there a way to enable firmware logs
Replies: 0
Views: 129

Is there a way to enable firmware logs

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...
by rpinewbie01
Thu Sep 19, 2019 12:13 pm
Forum: Troubleshooting
Topic: u-boot port on RaspberryPi 4
Replies: 21
Views: 3398

Re: u-boot port on RaspberryPi 4

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...
by rpinewbie01
Thu Sep 19, 2019 8:05 am
Forum: Troubleshooting
Topic: u-boot port on RaspberryPi 4
Replies: 21
Views: 3398

Re: u-boot port on RaspberryPi 4

I was able to boot 64 bit uboot from tot denx. U-MMC:   [email protected]: 0, [email protected]: 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...
by rpinewbie01
Tue Sep 17, 2019 11:15 am
Forum: Troubleshooting
Topic: u-boot port on RaspberryPi 4
Replies: 21
Views: 3398

Re: u-boot port on RaspberryPi 4

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 ...

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