Dear bosmith, In message <29939469.p...@talk.nabble.com> you wrote: > > Is there a simple way to send data from a Linux user-space program to > U-Boot? > How about from U-Boot up to a user-space program?
I know of two communication methods: Using the environment (and fw_printenv/fw_setenv in Linux user space), and using a shared log buffer (which may be a bit difficult to read / process in U-Boot if that should be needed). > The data may change often enough that using fw_printenv and fw_setenv might > wear out the NAND storage area for the environment. Then put all this stuff in a UBI partition, and use the "env import" / "env export" features in U-Boot to access it (or extend the code to handle environment in a UBI partition directly). > The use-case is to have two kernel images, two root file systems, and to let > a user-space application specify which to use and then force a reboot. The > system will not lose power during this reboot. And you think you will switch betweent these two so often that using the environment would wear out the NAND? I think you are too pessimistic. > This seems like a common enough problem. Has anyone solved it before? Most people use the environment for this purpose. Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de Today is the yesterday you worried about tomorrow. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot