OK --> " I need to somehow write something that informs the bootloader to do the right thing. Do you know how to do this? "
If you have set of register in your processor which old the value in power up or down mode-value retention.. You can utilized that write some thing in register read at boot time and divert the path for booting==> go for recovery. If not , write some file or value on your storage media eg: NAND, SD/ MMC and read at the boot up.if you are trying it through adb then, i do not know much about USB and adb i have only used it. try from , UI -factory reset.hope it will help you. On Mar 31, 4:14 pm, "Bjarke F." <[email protected]> wrote: > Hi Robin > > The steps you outline seems like a solution that we can use. Thanks. > > One detail though, when I issue a "adb reboot recovery" or "adb reboot > bootloader" I need to somehow write something that informs the > bootloader to do the right thing. Do you know how to do this? > > On Mar 31, 10:43 am, Robin Gujjar <[email protected]> wrote: > > > Hi Bjarke, > > > Hmm .... i implemented it, what ever you are looking. foloow the below > > Step : > > > =={ I am assuming your recovery image is already implemented and ready > > to boot }=== > > Step : 1 : Open a simple file in android data or Cache partitions. > > from Java file ex: RecoverySystem.java, in which very first call come > > for recovery. and write any string in that File ex: "xyz" . Do this > > stuff from java code. > > > Step 2: Now Go to Uboot main file and when there a read happen for > > boot cmd, read the this file( i hope you can implement this by reading > > your file system from uboot code :) Option one read the file , second > > read the number of character in the file and then compare in uboot > > code and if match with your defind set go ahead for boot recovery > > image.). i hope you know , at this point , you will be changing your > > boot cmd ---> ponting on recovery Image. > > > Step 3 : dis works , very few change is required for the above > > solution. hope you will enjoy the above step : ) > > Step 4; --> think about the above opened file, what you can do for > > next step. > > > -- Robin > > > On Mar 31, 11:43 am, "Bjarke F." <[email protected]> wrote: > > > > Hi. > > > > Thanks for the link. This describes pretty much what I already have > > > discovered myself. > > > > What I am interested in in is the exact method used for passing on a > > > command to the bootloader. > > > Where in the kernel source is the functionality and where in the > > > bootloader source is it picked up? > > > > I would really appreciate if anyone can enlighten me on this, I have > > > spend quite a lot of time searching for this without much luck. > > > > /Bjarke -- unsubscribe: [email protected] website: http://groups.google.com/group/android-porting
