Question about bootloader

Posts: 1
Joined: Mon Feb 29, 2016 6:47 am

Question about bootloader

Mon Feb 29, 2016 7:02 am


I'm Heejin Park and a master course student of Pusan National University in South Korea.

I'm developing vocore in my version.
(In attachments, image file)

But, in flashing kernel procedure, occur a problem.

Vocore show error message "kernel CRC check error".

I suspect that there is error because of fast flashing speed(spi).

How can I bootloader compile to low spi speed?

If you have better solution for my situation, send me your advice.

And I'm sorry for my lack of english.

Take care.

Best regards.

Heejin Park.
myPCB.jpg (41.28 KiB) Viewed 4154 times

Posts: 812
Joined: Sun Oct 19, 2014 6:00 am

Re: Question about bootloader

Sun Mar 06, 2016 12:53 am

There is tons of possibility. Without sch and pcb I can do nothing :)

Posts: 240
Joined: Sat Nov 29, 2014 3:22 pm

Re: Question about bootloader

Tue Mar 08, 2016 12:19 am

As Vonger says, many many possibilities.

You mention spi, are you doing an initial load to the flash chip or are you loading a new openwrt image?

This is how I write to the flash chip using flashrom. Flashrom on my PC communicates with the programmer (arduino uno) at 115200 baud and the process takes over an hour so the spi speed must be much slower than 115200. Make sure you hold the 5351 PORST low when writing the flash. I only write uboot this way.

If you already have uboot on the flash use the UART or Ethernet to load the openwrt image, they are much friendlier. The MTK uboot is able to do either.

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