Ralph Metzler wrote: > Hi, > > =?EUC-KR?B?sK29xbHU?= writes: > > I am trying to port a linux 2.4 to R3000 based system (LSI LOGIC > > SC2000). > > SC2000 have caches. one is Two-way set associative or direct mapped > > Instruction cache (16K) and another is Direct-mapped data cache(8K). > > I also spent one or two weeks with Linux on an SC2000 a while ago > but had to stop due to other more important projects. I also ran > into problems with the caching. Without caching I got it to boot > via NFS. Anyway, at least one mistake is in this part: > > > ---------------lsi-cache.S-------------------------------- > > > > /* void flush_icache(void) */ > > LEAF(flush_icache) > > .set noreorder > > > > la a3, icache_size # 8Kbyte > > lw t4, 0(a3) > > > > mfc0 t7, CP0_STATUS # save SR > > nop > > nop > > > > and t0, t7, ~ST0_IEC # disable interrupts > > mtc0 t0, CP0_STATUS > > nop > > nop > > > > li t3, CBSYS # BBCC configuration register > > lw t8, 0(t3) # save config. register > > nop > > > > li t0, KSEG0 > > or t4, t4, t0 # end of I-cache > > > > move t5, t0 > > > > 2: la t0, 3f # switch to Kseg1 > > or t0, KSEG1 > > jr t0 > > nop > > > > # > > # flush I-cache set 0 > > # > > 3: > > li t0, (CFG_DCEN | CFG_ICEN) > > or t0, CFG_CMODE_ITEST # I-cache set1 enable > > # D-cache enable, I-cache set0 > > enable > > # I-cache software test > > sw t0, 0(t3) > > lw zero, 0(t3) > > addi zero, zero, 1 > > > > move t0, t5 > > 4: sw zero, (t0) > > nop > > lw zero, (t0) > > addu t0, t6 > > bltu t0, t4, 4b > > nop > > Where does t6 get set? > This bug already is in the LSI sample code. > I think they just copied the loop code from the cache invalidation > functions (where they actually do determine t6 from the cache > line size) and forgot to adjust it. > > Best regards, > Ralph > > -- > /--------------------------------------------------------------------\ > | Dr. Ralph J.K. Metzler | Convergence integrated media | > |--------------------------------|-----------------------------------| > | rjkm@convergence.de | http://www.convergence.de/ | > \--------------------------------------------------------------------/ Thank you. I modified the bug. but problem is same. Regards, Shinkyu.
