Re: [RM9200] Using data bus and address bus through Linux Kernel
Frederic Kwiatkowski <[email protected]>
| Newsgroups | gmane.linux.ports.arm.general |
|---|---|
| Message-ID | <[email protected]> |
Hello Ole, 2009/5/4 Ole Loots <[email protected]> > Hello Frederic, > >> The main problem is that during the init step, it seems that an access to >> flash memory is done (input/output error in shell, JFFS2 notice in debug). >> >> > As far as I remember, CS7 memory region works well for me. Ok, so i'll try on CS7 as soon as possible to compare with CS4 and watch if I've got the same input/output error So I have several question about all of this. >> - Is this possible to access to data and address bus such as I/O's even if >> SDRAM, Flash memory and so on are connected? >> >> > Yes, I'm doing that, it works fine with CS7 memory region. > >> - If data bus can be used through writeb, is there any possibilty for >> address bus to be accessed in a similar way? >> >> > When you use writeb on the CS regions - than that involves the address bus. > writeb in the CS7 region puts the adress to the adress bus... > Furthermore there are some address bus pins that are multiplexed with the > GPIO's, a21-a23, I believe. So writing to 0x703FF FFFF will put the address bus to 0x003F FFFF (if we don't care about multiplexing with the GPIO)? Thanks for your help Regards, Frederic ------------------------------------------------------------------- List admin: http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm FAQ: http://www.arm.linux.org.uk/mailinglists/faq.php Etiquette: http://www.arm.linux.org.uk/mailinglists/etiquette.php