[U-Boot] How to restore NVRAM on MTD partition from backup

[A.W.C.]

Missed that mail :(

it's old board, I have no source code for that customized version of bootloader.

I have commands 
loadb   - load binary file over serial line (kermit mode)
loads   - load S-Record file over serial line
loady   - load binary file over serial line (ymodem mode)

NAND device: Manufacturer ID: 0xad, Chip ID: 0x75 (Hynix NAND 32MiB 3,3V 8-bit)
The NVRAM is MTD partition on "gen_nand":
0x01f00000-0x01f80000 : "NVRAM"
dev:    size   erasesize  name
mtd9: 00080000 00004000 "NVRAM"

The cp command is available in bootloader

# help cp
cp [.b, .w, .l] source target count
    - copy memory




Regards,
Alex
--------------------------------------------
On Fri, 12/22/17, Lukasz Majewski <lukma at denx.de> wrote:

 Subject: Re: [U-Boot] How to restore NVRAM on MTD partition from backup
 To: "A.W.C." <bluestream at ymail.com>
 Cc: u-boot at lists.denx.de
 Date: Friday, December 22, 2017, 11:58 PM
 
 On Wed, 20 Dec 2017 13:19:58
 +0000 (UTC)
 "A.W.C." <bluestream at ymail.com>
 wrote:
 
 > Hi,
 > 
 > U-Boot 2009.03 on
 custom board. 
 
 Nice :-)
 
 I assume that it is not
 possible to move to newer one?
 
 >How to restore NVRAM on MTD partition
 > from backup use U-boot memory commands, by
 uploading backup over
 > serial line?
 (kermit mode or ymodem mode) NAND flash type.
 
 It depends on what commands do
 you have?
 
 Yes, it would be
 best to use load command to get the data via serial
 line, store it in RAM and then flash it on
 persistent memory.
 
 How do
 you access NVRAM? (Is it really this memory - not some
 Parallel
 NAND, SPI-NOR, OneNAND)?
 
 If it has a custom driver
 ,then you may want to look for 'cp' or other
 command.
 
 >
 
 > Regards,
 >
 Alex
 > 
 > 
 >
 _______________________________________________
 > U-Boot mailing list
 >
 U-Boot at lists.denx.de
 > https://lists.denx.de/listinfo/u-boot
 
 
 
 Best regards,
 
 Lukasz Majewski
 
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