On Tue, 2008-08-19 at 09:00 +0200, Sébastien Chrétien wrote: > I have no screen that's why I have to use UART. I followed the CPM > model in head_32.S : > #ifdef CONFIG_PPC_EARLY_DEBUG_CPM > setup_cpm_bat: > lis r8, 0xf000 > ori r8, r8, 0x002a > mtspr SPRN_DBAT1L, r8 > > lis r11, 0xf000 > ori r11, r11, (BL_1M << 2) | 2 > mtspr SPRN_DBAT1U, r11 > > blr > #endif
The "EARLY DEBUG" stuff is a pile of hacks to help with bringup, it's definitely not a long term solution to your problems. You may also want to look at Grant Likely's work on doing proper early ioremap using BATs. > With this code I can use udbg. > > According to you, what is the best way ? The above is fine for early debug console. But that's definitely not the only kind of thing you may want to put in your setup_arch()... Look at what others do. Ben. > 2008/8/18, Benjamin Herrenschmidt <[EMAIL PROTECTED]>: > On Mon, 2008-08-18 at 16:17 +0200, Sébastien Chrétien wrote: > > The mpc7448hpc2 uses a tsi108-bridge. My board uses an IP on > a FPGA.. > > I read the code of mpc7448_hpc2.c. > > It uses a ioremap in order to iniatilize the tsi108 > registers. But I > > have already initialized MMU with my registers in HEAD_32.S. > Do I need > > to use ioremap in setup_arch() ? > > > Why did you hack head_32.S ? You shouldn't do that... This is > common > code, not platform code. > > Ben. > > > > > > > > > 2008/8/18, Michael Ellerman <[EMAIL PROTECTED]>: > > On Mon, 2008-08-18 at 13:35 +0200, Sébastien > Chrétien wrote: > > > Can somebody explain me the aim of the > > function "setup_arch" in the > > > machine_call structure ? > > > > > > Is this MPC7448 anything like an mpc7448hpc2 ? > > > > If so maybe you should start by looking at the code > for it in: > > > > arch/powerpc/platforms/embedded6xx/mpc7448_hpc2.c > > > > Even if it's not related, that will give you some > idea of what > > the > > callbacks are for. > > > > cheers > > > > -- > > Michael Ellerman > > OzLabs, IBM Australia Development Lab > > > > wwweb: http://michael.ellerman.id.au > > phone: +61 2 6212 1183 (tie line 70 21183) > > > > We do not inherit the earth from our ancestors, > > we borrow it from our children. - S.M.A.R.T Person > > > > > > _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
