[C Series]How to get access to U-boot and stop the autoboot?

[tempinbox]

How to get access to U-boot and stop the autoboot in C series?
i try the instructions that are wrote on wiki for b-series but doesn't works on C series.
I try to hold the ~
i try ctrl+c
i try space
But i can't get access to uboot.

@juuso if you know somenthing and you won't write here please write a PM.
I think you know how to do this i read that you have patched a t-val6deuc fw and i think that to do this you need access to u-boot.

[juusso]

You can install any firmware to c series (patched, modified) over shell BUT one is required, you need to calculate and flash right hashes for your new exe.img. on the forum you can find tools for hash calculation. You don't need uboot access at all for that. Sure, you should't make mistake...

Afaik we don't have uboot access because here isn't any on c/d/e series. But by corecting hashes we have already pached firmwares running. No problem at all. Just the question is: what is needed to patch and who should do this.

[tempinbox]

Thanks for your reply.
Where i can find more info about this? calculating hash and flashing firmware by shell???
my idea is to try to boot fw from usb so if something gone wrong it is possible to restore everything.
Is possible to do it on c series?
I know that for t-val6deuc fw the fw was patched and flash successfully but i can't find info on wiki about this process.
Maybe i have to use physical memory read and write in Debug menu???
another question i read the thread dissecting c750 bootloader and what i read is that c series has the uboot.
Thanks for your answers juuso

[juusso]

Info related to T-VAL6DEUC:
viewtopic.php?f=10&t=2255#p19071
viewtopic.php?f=10&t=2165#p18288
NB, the kernel attached is for T-VAL6DEUC only

Hash calculations:
viewtopic.php?f=2&t=655&p=18808#p18808

Sorry, no tutors available how to do this. Calculated and double checked hashes are to be written to corresponding cmac.bin place and flashed to corresponding partition (bml0/9 or bml0/10).

To get custom boot sequence it is needed to change bootup script (rc.local), change mount sequence, load usb drivers to get firmware booted from USB, not from flash. I don`t know it is hard for you or not... All is possible by changing rootfs only.