-----Original Message----- From: Dieter Kiermaier [mailto:dk-arm-linux@gmx.de] Sent: Friday, June 19, 2009 3:17 PM To: Prafulla Wadaskar Cc: u-boot@lists.denx.de Subject: Re: [U-Boot] Marvell Kirkwood newbie question GPIO functions
Prafulla,
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What patches are in the pipeline?
Some other board supports (MV88F6281GTW_GE) and Kirkwood SPI driver support Kirkwood USB support (at this moment)
Also very interesting :)
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What I forgot to mention is the i2c driver inside u-boot. I need this to read the mac address from an additional eeprom. This makes mass production more ease and doesn't produce
hight costs
:)
Kirkwood has in-built i2c(TWSI) controller, well.. the plans are in place enable driver for it, but this is not blocking issue
right now
hence pending ;-)
Just FYI: you can protect some flash sector and use it in place of eeprom, this will lower the board cost and complexity too.
But if you are planning to use some different GPIOs for i2c and bit-banged driver on the top of it, then you will need gpio
control,
so you can do it by using simple readl/writel calls
meanwhile driver
to come in :-)
Yes, I thought about that, too. GPIO support will also be helpful for doing this! Do you have some snippets how to readl/writel by hand?
You can refer kw_config_gpio function in cpu/arm926ejs/kirkwood/cpu.c
The best way I will suggest you is: Put pre-programmed eeprom around Kirkwood TWSI interface and enable "TWSI serial ROM initialization" you don't need anything else for this. (I hope you are having enough kirkwood documentation)
Ref: table 32:
http://www.marvell.com/files/products/embedded_processors/kir
kwood/HW_8
8F62 81_OpenSource.pdf
Good idea - I will read about that. I've got access to all documents - including an marvell web account for internal documents.
That's very good...
Regards.. Prafulla . .
Regards, Dieter
Regards.. Prafulla . .
Dieter
I'm willing to contribute some code if someone
guides me a bit?
You are most welcomed.... Pls feel free to raise your queries...
Here they are :) Thanks, Dieter
Regards.. Prafulla . .
Thanks in advance, Dieter
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