In the PMC pm49fl004, You got eight 64K size blocks. You can erase the individual block and write that block only.
Regards YH -----邮件原件----- 发件人: Li-Ta Lo [mailto:[EMAIL PROTECTED] 发送时间: 2004年4月21日 9:49 收件人: YhLu 抄送: LinuxBIOS 主题: Re: 答复: 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 > -----邮件原件----- > 发件人: Li-Ta Lo [mailto:[EMAIL PROTECTED] > 发送时间: 2004年4月21日 9:09 > 收件人: YhLu > 抄送: LinuxBIOS > 主题: 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
