Surprisingly, I can move my I/O with BDI2000 by modifing directly the PDATC value at the telnet server. The BDI doc says the adress written at the telnet server are never translated. So I guess I got the physical adress. However, I tried translating the adress and I do not get satisfying results either.
--- Gary Thomas <gary at mlbassoc.com> a ?crit?: > On Mon, 2003-05-26 at 06:39, vincent poirson wrote: > > Well, I forgot one operand in the addis > instruction > > but otherwise my code is OK. I checked that the > right > > PDATC adress was in the GPR. > > I also forgot to say that my code works when I put > it > > in a interrupt handler in a normal kernel module. > > What I do not understand is why the kernel keeps > going > > in machine check exception when I try to load > PDATC > > contents or store a value in PDATC. > > > > Are you sure that the address you are using is > correct? In particular, > this may be a mapped (via MMU) address. The > physical address can often > be different. When you are executing in this mode, > you must use the > physical address. > > > > > > > --- None Atall <linux_meis at yahoo.com> a ?crit : > > You > > missed a small shift... :) > > > > > > ----------------------- > > > li r16,r16,0x10 > > > li r13, 0xf001 > > > slw r13,r13,r16 > > > addis r13, 0x0d50 > > > stw r14, 0(r13) > > > ----------------------- > > > > > > Dimitris. > > > > > > --- vincent poirson <poirsonv at yahoo.fr> wrote: > > > > > > > > Hello, > > > > > > > > I want to change my PDATC value while in > > > > HardwareInterrupt code (in kernel/head.S) > where > > > MMU > > > > is > > > > off. So I simply do : > > > > li r13, 0x0d50 > > > > addis r13, 0xf001 > > > > stw r14, 0(r13) > > > > // where 0xf0010d50 is my PDATC adress and r14 > the > > > > value I want to store > > > > I do not understand why my kernel crahes and > goes > > > in > > > > machine exception. Surprisingly, I can change > > > PDATC > > > > with BDI2000 but not with assembler code. Is > this > > > an > > > > adress translation problem ? > > > > Am I missing something obvious ? Any help will > be > > > > appreciated. > > > > > > > > Thanks in advance. > > > > > > > > > > > > > > > > > > > > > ===== > > > > > > ------------------------------------------------------------ > > > -Dhmhtrios Meidanis > > > -Degree in Mathematics, University of the > Aegean. > > > -Master in Computer Architecture and Digital > > > Systems, University of Crete. > > > Greece. > > > > > > ------------------------------------------------------------ > > > > > > > > -- > Gary Thomas <gary at mlbassoc.com> > MLB Associates > ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
