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<bih420[m]>
Hello, hope my message delivered 😅. I want to port das u-boot on bcm 4xxx but I am totally new if anyone knows something please guide thanks
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<jurc192>
Hello world! I am trying to use U-boot on Raspberry Pi 4B, but have troubles getting it to work - what is a good place to ask for support?
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<marex>
j`ey: bootX $kerneladdr - $fdtcontroladdr
<marex>
bih420[m]: bcm4xxx is some mips ?
<j`ey>
marex: so $fdtcontroladdr is a 'builtin' variable?
<marex>
yeah, it points to the relocated address of the U-Boot control DT
<j`ey>
marex: cool!
<j`ey>
I still havent gotten u-boot booting my kernel, will try again this weekend maybe!
<marex>
is that the apple m-something ?
<bih420[m]>
<marex> "bih420: bcm4xxx is some mips ?" <- it is arm processor
<j`ey>
marex: m1 yeah
<marex>
oh ok
<bih420[m]>
j`ey: there is netbsd one for m1
<bih420[m]>
but i was unable to boot anything i have to build again i guess :(
<j`ey>
bih420[m]: yep and Im using the u-boot fork from an opensbd developer
<marex>
kettenis, no ?
<j`ey>
exactly!
<bih420[m]>
marex: yes
<bih420[m]>
bih420[m]: BCM4360 this chip exactly
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<bih420[m]>
official uboot support BCM 7xxx but not this (4xxx) one it have CFE now I am new so I want to either replace or just use CFE for boot then switch to u-boot is I am doing right?
<marex>
How to get WiFi working with BCM4360 (Macbook Air 2014) ... heh
<marex>
oh, CFE, I vaguely recall it
<marex>
bih420[m]: do you have the CFE sources ?
<marex>
j`ey: why dont you just drop him an email ?
<bih420[m]>
marex: no
<j`ey>
marex: well afaik he's booting from nvme, Ive just been trying this other approach for fun and learning :)
<bih420[m]>
j`ey: you are doing .vmacho thing?
<marex>
bih420[m]: is that some router ?
<marex>
j`ey: oh ok
<bih420[m]>
like bpuitl -nkcas
<bih420[m]>
marex: yes r7000
<bih420[m]>
> <@marex:libera.chat> bih420: is that some router ?
<bih420[m]>
* yes r7000 netgear
<j`ey>
bih420[m]: yes I have that working, just not uboot yet. I can boot the linux kernel another way
<marex>
bih420[m]: did you try talking to the openwrt people ? They might at least have some documentation for the SoC
<marex>
I assume you dont have the soc documentation or schematics of the board
<marex>
bih420[m]: well, if you have a lot of motivation ... it could be doable, of course :)
<marex>
bih420[m]: although I assume there might be some DRAM controller which needs specific init, that might need to be pulled out of your CFE blob
<bih420[m]>
j`ey: afaik we can't use outside bootloader iBoot doesn't allow that so bootloader must be present in NVME and then we can boot into something else
<bih420[m]>
marex: tried their forum noone replied :(
<bih420[m]>
s/noone/no-one/
<bih420[m]>
marex: motivation and free time I have plenty. how much time it will take i will give but end result I want to learn something :)
<bih420[m]>
<marex> "bih420: although I assume..." <- oh that's new for me i have serial connection in front of me. first I have to learn CFE then u-boot. just curious can get CFE blobs from TFTP?
<marex>
bih420[m]: last I saw CFE somewhere was a decade ago, so ... maybe ?
<marex>
bih420[m]: isnt there some #openwrt-devel here ?
<cambrian_invader>
cfe does tftp
<marex>
bih420[m]: you will want to wire up JTAG, and see if it works, look at openocd
<bih420[m]>
never asked on irc/matrix
<marex>
if it does work, then you can mess around with the bootloader
<marex>
make sure to dump storage, likely some NOR flash, to recover the board if something goes real wrong
<cambrian_invader>
^^
<bih420[m]>
marex: it had JFFS which I can dump and some forum have custom CFE for this router but I never flashed that thing. only custom os like DDWRT and tomato
<bih420[m]>
for jtag i need schematics. (which i don't have) and stm32 dev board take ages to ship here :( sad lyf
<bih420[m]>
so i am in liberachat server sorry I am using matrix as default message will delayed :(
<marex>
oh, jffs ... so is that stuff in NAND or NOR ?
<marex>
bih420[m]: JTAG is likely gonna look like standard-ish connector, some 2x7 or 2x10 pins or so
<bih420[m]>
so basically I have UART right now I have to find JTAG with that jtag I can dump blobs .. let me check more forum may be they have other way to dump. thanks you so much for clearing my doubt
<bih420[m]>
bih420[m]: sorry i messed up while reply your message from phone
<marex>
bih420[m]: well you can drop into the bootloader (CFE, probably?) and dump the firmware from there, but you might not be able to write it back into the flash in case you mess the flash up
<marex>
that's where bootloader recovery options come in , like JTAG
<bih420[m]>
marex: understood thank you so much i have this doubt from ages
<marex>
sure
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