diff options
Diffstat (limited to 'cpu/mpc86xx/cpu.c')
| -rw-r--r-- | cpu/mpc86xx/cpu.c | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/cpu/mpc86xx/cpu.c b/cpu/mpc86xx/cpu.c index f7e012db5..188757587 100644 --- a/cpu/mpc86xx/cpu.c +++ b/cpu/mpc86xx/cpu.c @@ -1,5 +1,5 @@ /* - * Copyright 2006,2009 Freescale Semiconductor, Inc. + * Copyright 2006,2009-2010 Freescale Semiconductor, Inc. * Jeff Brown * Srikanth Srinivasan (srikanth.srinivasan@freescale.com) * @@ -197,3 +197,37 @@ void mpc86xx_reginfo(void) printf("\tBR7\t0x%08X\tOR7\t0x%08X \n", in_be32(&lbc->br7), in_be32(&lbc->or7)); } + +/* + * Set the DDR BATs to reflect the actual size of DDR. + * + * dram_size is the actual size of DDR, in bytes + * + * Note: we assume that CONFIG_MAX_MEM_MAPPED is 2G or smaller as we only + * are using a single BAT to cover DDR. + * + * If this is not true, (e.g. CONFIG_MAX_MEM_MAPPED is 2GB but HID0_XBSEN + * is not defined) then we might have a situation where U-Boot will attempt + * to relocated itself outside of the region mapped by DBAT0. + * This will cause a machine check. + * + * Currently we are limited to power of two sized DDR since we only use a + * single bat. If a non-power of two size is used that is less than + * CONFIG_MAX_MEM_MAPPED u-boot will crash. + * + */ +void setup_ddr_bat(phys_addr_t dram_size) +{ + unsigned long batu, bl; + + bl = TO_BATU_BL(min(dram_size, CONFIG_MAX_MEM_MAPPED)); + + if (BATU_SIZE(bl) != dram_size) { + u64 sz = (u64)dram_size - BATU_SIZE(bl); + print_size(sz, " left unmapped\n"); + } + + batu = bl | BATU_VS | BATU_VP; + write_bat(DBAT0, batu, CONFIG_SYS_DBAT0L); + write_bat(IBAT0, batu, CONFIG_SYS_IBAT0L); +} |