From 9ff32d8ccf0e23b5577c25610f001af8d761b4a2 Mon Sep 17 00:00:00 2001 From: Timur Tabi Date: Mon, 29 Mar 2010 12:51:07 -0500 Subject: [PATCH] mpc86xx: set the DDR BATs after calculating true DDR size After determining how much DDR is actually in the system, set DBAT0 and IBAT0 accordingly. This ensures that the CPU won't attempt to access (via speculation) addresses outside of actual memory. On 86xx systems, DBAT0 and IBAT0 (the BATs for DDR) are initialized to 2GB and kept that way. If the system has less than 2GB of memory (typical for an MPC8610 HPCD), the CPU may attempt to access this memory during speculation. The zlib code is notorious for generating such memory reads, and indeed on the MPC8610, uncompressing the Linux kernel causes a machine check (without this patch). 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. Signed-off-by: Timur Tabi Signed-off-by: Kumar Gala --- board/freescale/mpc8610hpcd/mpc8610hpcd.c | 2 ++ board/freescale/mpc8641hpcn/mpc8641hpcn.c | 2 ++ cpu/mpc86xx/cpu.c | 36 ++++++++++++++++++++++- cpu/mpc86xx/cpu_init.c | 4 +++ include/asm-ppc/mmu.h | 6 +++- include/configs/MPC8610HPCD.h | 6 ++-- include/configs/MPC8641HPCN.h | 4 +-- include/mpc86xx.h | 2 ++ 8 files changed, 53 insertions(+), 9 deletions(-) diff --git a/board/freescale/mpc8610hpcd/mpc8610hpcd.c b/board/freescale/mpc8610hpcd/mpc8610hpcd.c index 784a2ed686..ab5f800453 100644 --- a/board/freescale/mpc8610hpcd/mpc8610hpcd.c +++ b/board/freescale/mpc8610hpcd/mpc8610hpcd.c @@ -127,6 +127,8 @@ initdram(int board_type) dram_size = fixed_sdram(); #endif + setup_ddr_bat(dram_size); + puts(" DDR: "); return dram_size; } diff --git a/board/freescale/mpc8641hpcn/mpc8641hpcn.c b/board/freescale/mpc8641hpcn/mpc8641hpcn.c index c521527d89..443c9fd8ec 100644 --- a/board/freescale/mpc8641hpcn/mpc8641hpcn.c +++ b/board/freescale/mpc8641hpcn/mpc8641hpcn.c @@ -74,6 +74,8 @@ initdram(int board_type) dram_size = fixed_sdram(); #endif + setup_ddr_bat(dram_size); + puts(" DDR: "); return dram_size; } diff --git a/cpu/mpc86xx/cpu.c b/cpu/mpc86xx/cpu.c index f7e012db57..188757587f 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); +} diff --git a/cpu/mpc86xx/cpu_init.c b/cpu/mpc86xx/cpu_init.c index 5a78a9cdc7..b4f047d85d 100644 --- a/cpu/mpc86xx/cpu_init.c +++ b/cpu/mpc86xx/cpu_init.c @@ -138,8 +138,12 @@ int cpu_init_r(void) /* Set up BAT registers */ void setup_bats(void) { +#if defined(CONFIG_SYS_DBAT0U) && defined(CONFIG_SYS_DBAT0L) write_bat(DBAT0, CONFIG_SYS_DBAT0U, CONFIG_SYS_DBAT0L); +#endif +#if defined(CONFIG_SYS_IBAT0U) && defined(CONFIG_SYS_IBAT0L) write_bat(IBAT0, CONFIG_SYS_IBAT0U, CONFIG_SYS_IBAT0L); +#endif write_bat(DBAT1, CONFIG_SYS_DBAT1U, CONFIG_SYS_DBAT1L); write_bat(IBAT1, CONFIG_SYS_IBAT1U, CONFIG_SYS_IBAT1L); write_bat(DBAT2, CONFIG_SYS_DBAT2U, CONFIG_SYS_DBAT2L); diff --git a/include/asm-ppc/mmu.h b/include/asm-ppc/mmu.h index fd1024947d..ce7f081005 100644 --- a/include/asm-ppc/mmu.h +++ b/include/asm-ppc/mmu.h @@ -213,7 +213,11 @@ extern void print_bats(void); #define BATL_PADDR(x) ((phys_addr_t)((x & 0xfffe0000) \ | ((x & 0x0e00ULL) << 24) \ | ((x & 0x04ULL) << 30))) -#define BATU_SIZE(x) (1UL << (fls((x & BATU_BL_MAX) >> 2) + 17)) +#define BATU_SIZE(x) (1ULL << (fls((x & BATU_BL_MAX) >> 2) + 17)) + +/* bytes into BATU_BL */ +#define TO_BATU_BL(x) \ + (u32)((((1ull << __ilog2_u64((u64)x)) / (128 * 1024)) - 1) * 4) /* Used to set up SDR1 register */ #define HASH_TABLE_SIZE_64K 0x00010000 diff --git a/include/configs/MPC8610HPCD.h b/include/configs/MPC8610HPCD.h index 1d2d659239..fed441eb37 100644 --- a/include/configs/MPC8610HPCD.h +++ b/include/configs/MPC8610HPCD.h @@ -341,10 +341,8 @@ * BAT0 2G Cacheable, non-guarded * 0x0000_0000 2G DDR */ -#define CONFIG_SYS_DBAT0L (BATL_PP_RW | BATL_MEMCOHERENCE) -#define CONFIG_SYS_DBAT0U (BATU_BL_2G | BATU_VS | BATU_VP) -#define CONFIG_SYS_IBAT0L (BATL_PP_RW | BATL_MEMCOHERENCE ) -#define CONFIG_SYS_IBAT0U CONFIG_SYS_DBAT0U +#define CONFIG_SYS_DBAT0L (BATL_PP_RW) +#define CONFIG_SYS_IBAT0L (BATL_PP_RW) /* * BAT1 1G Cache-inhibited, guarded diff --git a/include/configs/MPC8641HPCN.h b/include/configs/MPC8641HPCN.h index 12a8f60390..94e4d243e8 100644 --- a/include/configs/MPC8641HPCN.h +++ b/include/configs/MPC8641HPCN.h @@ -482,9 +482,7 @@ extern unsigned long get_board_sys_clk(unsigned long dummy); * BAT0 DDR */ #define CONFIG_SYS_DBAT0L (BATL_PP_RW | BATL_MEMCOHERENCE) -#define CONFIG_SYS_DBAT0U (BATU_BL_2G | BATU_VS | BATU_VP) -#define CONFIG_SYS_IBAT0L (BATL_PP_RW | BATL_MEMCOHERENCE ) -#define CONFIG_SYS_IBAT0U CONFIG_SYS_DBAT0U +#define CONFIG_SYS_IBAT0L (BATL_PP_RW | BATL_MEMCOHERENCE) /* * BAT1 LBC (PIXIS/CF) diff --git a/include/mpc86xx.h b/include/mpc86xx.h index c6f30f9fd5..eb85d60cad 100644 --- a/include/mpc86xx.h +++ b/include/mpc86xx.h @@ -83,5 +83,7 @@ static __inline__ unsigned long get_l2cr (void) return l2cr_val; } +void setup_ddr_bat(phys_addr_t dram_size); + #endif /* _ASMLANGUAGE */ #endif /* __MPC86xx_H__ */ -- 2.39.5