On Wed, 2004-04-21 at 11:03, YhLu wrote: > In the PMC pm49fl004, You got eight 64K size blocks. > > You can erase the individual block and write that block only. > > Regards > > YH >
The problem is the block size is different for different flash parts. It requires a lot of code to handle this difference. It is the reason why MTD got so big. Ollie > -----éäåä----- > åää: Li-Ta Lo [mailto:[EMAIL PROTECTED] > åéæé: 2004å4æ21æ 9:49 > æää: YhLu > æé: LinuxBIOS > äé: Re: çå: flash_rom start and size > > On Wed, 2004-04-21 at 10:40, YhLu wrote: > > For example, > > 1. I only want to let end user to flash normal part [0-384k), and don't > let > > him touch fallback part [384k, 512k). > > there is no way you can really lock the flash. > > > 2. or I only want to update the payload image in the beginning, [0,64k). > > > > you need some kind of flash translation layer to accomplish this. You > need to back up some part of the erase block you want reserve , erase > the block and write with updated and reserved data. > > You probably need MTD. > > Ollie > > > Regards > > > > Yinghai Lu > > -----éäåä----- > > åää: Li-Ta Lo [mailto:[EMAIL PROTECTED] > > åéæé: 2004å4æ21æ 9:09 > > æää: YhLu > > æé: LinuxBIOS > > äé: Re: flash_rom start and size > > > > On Tue, 2004-04-20 at 20:06, YhLu wrote: > > > Ollie or David, > > > > > > Can you modify the flash_rom to take start and size command line? > > > > > > I mean > > > > > > Flash_rom -start=0k -size=384k xxxx.rom > > > > > > And xxxx.rom only to be 384k. > > > > > > > Why do you want to do this ? You should prepare the image > > the same size as your flash chip. > > > > There are techinical difficulty doing this. Most flash > > parts are block/sector erase and byte program. There is > > no general way to start from an abitrary address to any > > size. > > > > Ollie > > > > > Regards > > > > > > YH > > > > > _______________________________________________ > > Linuxbios mailing list > > [EMAIL PROTECTED] > > http://www.clustermatic.org/mailman/listinfo/linuxbios > > > _______________________________________________ Linuxbios mailing list [EMAIL PROTECTED] http://www.clustermatic.org/mailman/listinfo/linuxbios
