Hi, In arch/powerpc/kernel/head_44x.S file, it says it clears all the TLBs except the current working one. In our case we have mainly 3 TLBs for FLASH, SRAM and the UART. We have the TLB of 16MB of SRAM *which is our total memory*. So the TLBs that we create from our bootloader will be used for the entire linux operation. I am attaching the TLB initialization code with this mail, does it make any problem ?
li r3,1 # Slot1 SRAM LOADREG_32 r4,0x0 LOADREG_32 r6, ( TLB_I_MASK | TLB_U_RWX | TLB_S_RWX |TLB_G_MASK ) LOADREG_32 r5,TLB_SIZE_16M mr r7,r4 bl Save_TLB Vineeth _ On Mon, Oct 12, 2009 at 7:04 PM, Vineeth _ <blackli...@gmail.com> wrote: > Hi Wolfgang, > > The link says about the initialization of the SDRAM; Does it > applicable in our case, where we have SRAM on our board. Does the > initialization means just clearing the memory in case of SRAM ? We > tried clearing the memory before the operation which doesnt work too. > We are creating a TLB of 16MB for the SRAM which is not cachable . > > -Vineeth > > On Fri, Oct 9, 2009 at 5:03 PM, Wolfgang Denk <w...@denx.de> wrote: >> Dear Vineeth _, >> >> In message <a9b543570910090320t1444f8f1qf4c8ab7dbbef6...@mail.gmail.com> you >> wrote: >>> We ported the uboot Memory test and tested the 15MB ram and it was >>> successful.interestingly we have only 16MB SRAM in our board.We used 1 >> >> Such a memory test means nothing. The only thing you can learn from it >> is that basic read and write accesses are working. You don;t get any >> information about the behaviour for burst mode accesses from such a >> test. See the FAQ at >> http://www.denx.de/wiki/view/DULG/LinuxCrashesRandomly and at >> http://www.denx.de/wiki/DULG/UBootCrashAfterRelocation >> >> Best regards, >> >> Wolfgang Denk >> >> -- >> DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel >> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany >> Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de >> I mean, I . . . think to understand you, I just don't know what you >> are saying ... - Terry Pratchett, _Soul Music_ >> > _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
