[U-Boot] FDT driver initialization function declaration

Michal Simek
2012-07-10T12:24:24Z

Dear Wolfgang,

On 07/10/2012 01:54 PM, Wolfgang Denk wrote:
> Dear Michal,
>
> In message<4FFC02BD.7060106@monstr.eu> you wrote:
>>
>> just want to open new topic about FDT driver initialization function
>> declaration.
>>
>> There are some drivers which can be simple move to fdt initialization.
>> I have in my mind ethernet drivers and then systemace (I have ported it).
>
> I"m not sure if it's a good idea to do this right now. Any such
> activities would in minimum cause a moving target for the upcoming
> driver model work, and most probably cause lots of conflicts on both
> sides.
>
> I think your plans should be co-ordinated (and probably be merged)
> with the DM group.

I wasn't aware about this group. I was CC in that announcement email
but I missed it. :-(

ok. I have signed to this ml. There are some familiar name and
also some czech guys. I have added u-boot-dm list to CC too.

Can someone update me about current state of device-tree model?

I will read archive and dm documentation in Marek's git tree.

Let me summarize what I have done and tested on microblaze.
I have ported emaclite/ll_temac/systemace/timer/intc/cfi-flash/spi-flash
uartlite/uart16550 (serial-multi) drivers.
My expectation is that minimum information I need for compilation is
u-boot starting address and microblaze compilation flags (the same one
as we need for the Linux kernel).

Serial console is selected based on aliases node where serial0 is always
the first console. Based on type driver is initialized.
I am using up to 4 uart16550 and 4 uartlite drivers but I do care just
for serial0-serial3 aliases.

The hardest part I have identify on microblaze was about u-boot variables.
Because based on information from device-tree you can choose where variables
should be stored and also this memory should be accessible before u-boot
try to read variables. It mean in very early state.

Thanks,
Michal

--
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/
Microblaze U-BOOT custodian