[U-Boot] Ethernet persistence

[Michal Simek <monstr@monstr.eu>]

Hi Simon,

On 02/28/2014 03:24 PM, Simon Glass wrote:
> Hi Anthony,
> 
> On 27 February 2014 09:09, Anthony Mahar <anthony.j.mahar@gmail.com> wrote:
> 
>> How can I make the ethernet connection persistent (after first use), rather
>> than reconnecting/re initializing on each reuse?
>>
>> I'm working with a Xilinx Zynq zc706 board and am up and running u-boot
>> quite successfully.  My main use case is to store u-boot in on-board flash,
>> and have u-boot tftp get / boot the bitstream, kernel image, devicetree,
>> and
>> ramdisk image.  The following script functions well:
>>         "qspiboot=echo Configure PL and booting Linux from TFTP... && " \
>>                 "fpga info 0;"
>>  \
>>                 "tftp 0x1000000 system.bin;"
>>  \
>>                 "fpga load 0 0x1000000 cb44bc;" \
>>                 "tftp 0x3000000 ${kernel_image};" \
>>                 "tftp 0x2A00000 ${devicetree_image};" \
>>                 "tftp 0x2000000 ${ramdisk_image};" \
>>                 "bootm 0x3000000 0x2000000 0x2A00000\0" \
>>
>>
>> The ethernet (Zynq's gem.e000b000) will get initialized on first use, as
>> appropriate, however the Ethernet is reinitialized and auto negotiated
>> again
>> for each subsequent tftp request which shouldn't be necessary.  A snippet
>> is
>> listed below.  Each 'reconnection' takes several seconds... a few to auto
>> negotiate, then a few more for the Windows based TFTP server to recognize
>> the connection and allow connections to the server.  Multiply this by the
>> number of transfers and it takes a very long time to transfer a very little
>> amount of data.
>>
> 
> Yes as Michal says you should use FIT and put everything in one file, or
> less than 4. I'm not sure if we have a command to load your FPGA image from
> FIT though. We could add one fairly easily now that we have
> fit_image_load().

I have this on my todo list and definitely I would love to extend FIT image
with adding FPGA to it.

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform


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