Embedded Linux device: how is performed NVRAM update? For example, updates of firmware, u-boot, uimage and other are performed from U-Boot, here sample code from U-boot:
update_uboot=tftpboot 0x80000100 u-boot.bin && protect off 0x48000000 +${filesize} && erase 0x48000000 +${filesize} && sleep ${sdelay} && cp.b ${fileaddr} 0x48000000 ${filesize} && protect on 0x48000000 +${filesize}
update_uimage=tftpboot 0x80000100 uImage && protect off ${UBFIADDR1} +${filesize} && erase ${UBFIADDR1} +${filesize} && sleep ${sdelay} && cp.b ${fileaddr} ${UBFIADDR1} ${filesize} && protect on ${UBFIADDR1} +${filesize}
There is no any directions or tips related to NVRAM update in U-boot code. The nvram.bin offset address is specified in code, so is it possible to write to NVRAM from U-boot shell mode? (even if there is no directions on U-boot) If yes, how to unlock NVRAM for writing from within u-boot shell?
Spansion Serial Flash FLASH_S25FL064A
here is U-boot dump with all commands inside: http://pastebin.com/raw.php?i=W6mnfUaq