Hi, We are writing existing drivers for mpc8260 FCC and writing new ones for MCC. we are unable to small (may be foolish) problem of accessing immap address registers.
In FCC code, eldk/ppc_82xx/usr/src/linux/arch/ppc/8260_io/fcc_enet.c, immap_t * immap is simply typecasted to IMAP_ADDR, which is ((uint)0xf0000000). Now, after assigning this physical address, fcc_enet code continues the immap_t variable without doing any __va macro. I am confused at this point, that how can kernel code access a physical address as if it were virtual address ? how does the page frame -> page conversion (and vice versa) happens on this front? Thanks and regards, Om. ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
