[U-Boot] Boot from USB support for Kirkwood SOC
xiangfu
xiangfu.z at gmail.com
Thu Jun 11 09:50:52 CEST 2009
Hi Prafulla Wadashar
Prafulla Wadaskar wrote:
>>>
>>> I am going to start "boot from USB Support" development for
>> kirkwood.
>> what this "boot from USB Support" means?
> Dear Xiangfu Liu
> To my development "Boot from USB Support" means, fetching kernel and rfs binaries from the file system/partition on storage connected on USB interface.
sounds good.
> There will be native u-boot on NAND or SPI flash that will bring up the system
> In the auto boot sequence through h/w triggers on the board like pushbutton/reset key we can initiate bootcmd for "boot_from_USB"
> For this I need to support h/w driver for Kirkwood and u-boot USB framework.
>
> This is one of good standalone method to recover system using USB interface (similar to pxeboot)
> in case of small embedded systems it would be very useful.
yes, agree.
>
> FYI: Kirkwood h/w supports Boot from SF/NANDF/SATA/PEX/UART but not USB :-) as you referenced for JZ4740
>
> Regards..
> Prafulla . .
>
>> I know "boot from nand",
>> and I know that the Ingenic CPU, support "boot from USB". is
>> the same meaning?
>>
>> here is part of JZ4740 cpu data sheet [1]
>> --
>> 3.7.3 BOOT
>> Jz4740 support 3 different boot sources depending on
>> BOOT_SEL0 and BOOT_SEL1 pin values.
>> Table 3-29 lists them.
>> Table 3-29 Boot from 3 boot sources
>>
>> BOOT_SEL1 BOOT_SEL0 Boot Source
>> 0 0 Boot from NOR flash at CS4
>> 0 1 Boot from USB device
>> 1 0 Boot from 512 page NAND flash at CS1
>> 1 1 Boot from 2k page NAND flash at CS1
>> --
>>
>> [1] ftp://ftp.ingenic.cn/2soc/Jz4740_ds.pdf
>>
--
Best Regards
Xiangfu Liu
jabber : xiangfu.z at gmail.com
skype : xiangfu.z
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