The MAXSIZE field in the TLB1CFG register is 4 bits, not 8 bits. This made setup_ddr_tlbs() try to set up a TLB larger than the e500 maximum (256 MB) which made u-boot hang in board_init_f() when trying to create a new stack in RAM. I have an mpc8540 with one 1GB dimm.
Signed-off-by: Fredrik Arnerup fredrik.arnerup@edgeware.tv
--- ../tmp/u-boot-2009.03/cpu/mpc85xx/tlb.c 2009-03-21 22:04:41.000000000 +0100 +++ cpu/mpc85xx/tlb.c 2009-05-14 19:26:17.000000000 +0200 @@ -134,7 +134,7 @@ unsigned int tlb_size; unsigned int ram_tlb_index = CONFIG_SYS_DDR_TLB_START; unsigned int ram_tlb_address = (unsigned int)CONFIG_SYS_DDR_SDRAM_BASE; - unsigned int max_cam = (mfspr(SPRN_TLB1CFG) >> 16) & 0xff; + unsigned int max_cam = (mfspr(SPRN_TLB1CFG) >> 16) & 0xf; u64 size, memsize = (u64)memsize_in_meg << 20;
size = min(memsize, CONFIG_MAX_MEM_MAPPED);