[U-Boot-Users] how to get result using eeprom cmd under u-boot 1.1

[U-Boot-Users] how to get result using eeprom cmd under u-boot 1.1

[Xu, Jin]

When I use " eeprom read 0 0 1 " cmd, It only display " EEPROM @0x0
read: addr 00000000  off 0000  count 1 ... done "

how can I get the value using the eeprom cmd ? 

 I am sure that the  funtion which eeprom_read ( cmd_eeprom.c )  call
are right. 

 
Thanks & Regards
Xu Jin
 

[U-Boot-Users] how to get result using eeprom cmd under u-boot 1.1

[Vladimir Gurevich]

Hello Jin,

Xu, Jin (SDC) wrote:
> When I use " eeprom read 0 0 1 " cmd, It only display " EEPROM @0x0
> read: addr 00000000  off 0000  count 1 ... done "
>   
The format of the "eeprom" command is (as I'm sure you already know):
    eeprom {read,write} <addr> <offset> <count>

The <addr> argument is the MEMORY address and that's where the result of 
the transaction will be placed.
Thus,
    1) Using 0 as <addr> is a pretty risky idea to begin with: :)
    2) The more proper usage will be:
       eeprom read 0x100000 0 10
       md.b 0x100000 10

And, of course, a quick look at the source code is worth thousand emails :)

Happy hacking,
Vladimir

[U-Boot-Users] how to get result using eeprom cmd under u-boot 1.1

[Xu, Jin]

Hello  Vladimir

 I already done. Thanks for your help!

I'd like share my note here.

How to update eeprom under Uboot
====================================

1 Create a binary file to store eeprom content
-----------------------------------------------
0x200 bytes.

2 Confige uboot environment variable and A TFTP server
------------------------------------------------------
make sure we can download the eeprom content file via tftp 
under the uboot shell.

exam: we put the eeprom content file  in the tftp root.

3 Update eeprom
------------------------------------------------------
Every thing is OK, and we can do the real job under the 
uboot shell now.

1st download the eeprom content file to uboot memory 0x140000:
=>tftp 0x140000 eeprom.bin

then we can check what in the memory:
=>md 0x140000

=>md 0x140100


now we can write to eeprom:
=>eeprom write 0x140000 0x0 0x200

at last we can check what has done:
=>read read 0x140300 0x0 0x200

=>md 0x140300

=>md 0x140400


Thanks & Regards
Xu Jin
 

-----Original Message-----
From: Vladimir Gurevich [mailto:vag at paulidav.org] 
Sent: 2006?2?13? 17:32
To: Xu, Jin (SDC)
Cc: u-boot-users at lists.sourceforge.net
Subject: Re: [U-Boot-Users] how to get result using eeprom cmd under u-boot 1.1

Hello Jin,

Xu, Jin (SDC) wrote:
> When I use " eeprom read 0 0 1 " cmd, It only display " EEPROM @0x0
> read: addr 00000000  off 0000  count 1 ... done "
>   
The format of the "eeprom" command is (as I'm sure you already know):
    eeprom {read,write} <addr> <offset> <count>

The <addr> argument is the MEMORY address and that's where the result of the transaction will be placed.
Thus,
    1) Using 0 as <addr> is a pretty risky idea to begin with: :)
    2) The more proper usage will be:
       eeprom read 0x100000 0 10
       md.b 0x100000 10

And, of course, a quick look at the source code is worth thousand emails :)

Happy hacking,
Vladimir