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https://github.com/AsahiLinux/u-boot
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135846d6ec
As it seems the "old" ECC initialization routine by using dflush() didn't write all lines in the dcache back to memory on lwmon5. This could lead to ECC error upon Linux booting. This patch changes the program_ecc() routine to now use clean_dcache_range() instead of dflush(). clean_dcache_range() uses dcbst which is exactly what we want in this case. Since dflush() is known is cause problems, this routine will be removed completely and replaced by clean_dcache_range() with an additional patch. Signed-off-by: Stefan Roese <sr@denx.de>
288 lines
7.7 KiB
C
288 lines
7.7 KiB
C
/*
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* (C) Copyright 2006
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* Sylvie Gohl, AMCC/IBM, gohl.sylvie@fr.ibm.com
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* Jacqueline Pira-Ferriol, AMCC/IBM, jpira-ferriol@fr.ibm.com
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* Thierry Roman, AMCC/IBM, thierry_roman@fr.ibm.com
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* Alain Saurel, AMCC/IBM, alain.saurel@fr.ibm.com
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* Robert Snyder, AMCC/IBM, rob.snyder@fr.ibm.com
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*
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* (C) Copyright 2007-2008
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* Stefan Roese, DENX Software Engineering, sr@denx.de.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/* define DEBUG for debugging output (obviously ;-)) */
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#if 0
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#define DEBUG
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#endif
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#include <common.h>
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#include <asm/processor.h>
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#include <asm/mmu.h>
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#include <asm/io.h>
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#include <asm/cache.h>
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#include <ppc440.h>
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#include <watchdog.h>
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/*
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* This DDR2 setup code can dynamically setup the TLB entries for the DDR2 memory
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* region. Right now the cache should still be disabled in U-Boot because of the
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* EMAC driver, that need it's buffer descriptor to be located in non cached
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* memory.
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*
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* If at some time this restriction doesn't apply anymore, just define
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* CFG_ENABLE_SDRAM_CACHE in the board config file and this code should setup
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* everything correctly.
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*/
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#ifdef CFG_ENABLE_SDRAM_CACHE
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#define MY_TLB_WORD2_I_ENABLE 0 /* enable caching on SDRAM */
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#else
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#define MY_TLB_WORD2_I_ENABLE TLB_WORD2_I_ENABLE /* disable caching on SDRAM */
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#endif
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/*-----------------------------------------------------------------------------+
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* Prototypes
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*-----------------------------------------------------------------------------*/
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extern int denali_wait_for_dlllock(void);
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extern void denali_core_search_data_eye(void);
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extern void dcbz_area(u32 start_address, u32 num_bytes);
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static u32 is_ecc_enabled(void)
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{
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u32 val;
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mfsdram(DDR0_22, val);
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val &= DDR0_22_CTRL_RAW_MASK;
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if (val)
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return 1;
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else
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return 0;
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}
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void board_add_ram_info(int use_default)
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{
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PPC4xx_SYS_INFO board_cfg;
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u32 val;
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if (is_ecc_enabled())
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puts(" (ECC");
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else
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puts(" (ECC not");
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get_sys_info(&board_cfg);
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printf(" enabled, %d MHz", (board_cfg.freqPLB * 2) / 1000000);
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mfsdram(DDR0_03, val);
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val = DDR0_03_CASLAT_DECODE(val);
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printf(", CL%d)", val);
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}
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#ifdef CONFIG_DDR_ECC
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static void wait_ddr_idle(void)
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{
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/*
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* Controller idle status cannot be determined for Denali
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* DDR2 code. Just return here.
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*/
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}
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static void program_ecc(u32 start_address,
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u32 num_bytes,
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u32 tlb_word2_i_value)
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{
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u32 val;
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u32 current_addr = start_address;
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u32 size;
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int bytes_remaining;
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sync();
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wait_ddr_idle();
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/*
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* Because of 440EPx errata CHIP 11, we don't touch the last 256
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* bytes of SDRAM.
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*/
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bytes_remaining = num_bytes - CFG_MEM_TOP_HIDE;
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/*
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* We have to write the ECC bytes by zeroing and flushing in smaller
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* steps, since the whole 256MByte takes too long for the external
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* watchdog.
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*/
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while (bytes_remaining > 0) {
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size = min((64 << 20), bytes_remaining);
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/* Write zero's to SDRAM */
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dcbz_area(current_addr, size);
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/* Write modified dcache lines back to memory */
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clean_dcache_range(current_addr, current_addr + size);
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current_addr += 64 << 20;
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bytes_remaining -= 64 << 20;
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WATCHDOG_RESET();
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}
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sync();
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wait_ddr_idle();
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/* Clear error status */
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mfsdram(DDR0_00, val);
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mtsdram(DDR0_00, val | DDR0_00_INT_ACK_ALL);
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/* Set 'int_mask' parameter to functionnal value */
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mfsdram(DDR0_01, val);
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mtsdram(DDR0_01, ((val &~ DDR0_01_INT_MASK_MASK) | DDR0_01_INT_MASK_ALL_OFF));
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sync();
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wait_ddr_idle();
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}
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#endif
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/*************************************************************************
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*
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* initdram -- 440EPx's DDR controller is a DENALI Core
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*
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************************************************************************/
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long int initdram (int board_type)
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{
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#if 0 /* test-only: will remove this define later, when ECC problems are solved! */
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/* CL=3 */
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mtsdram(DDR0_02, 0x00000000);
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mtsdram(DDR0_00, 0x0000190A);
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mtsdram(DDR0_01, 0x01000000);
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mtsdram(DDR0_03, 0x02030603); /* A suitable burst length was taken. CAS is right for our board */
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mtsdram(DDR0_04, 0x0A030300);
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mtsdram(DDR0_05, 0x02020308);
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mtsdram(DDR0_06, 0x0103C812);
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mtsdram(DDR0_07, 0x00090100);
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mtsdram(DDR0_08, 0x02c80001);
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mtsdram(DDR0_09, 0x00011D5F);
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mtsdram(DDR0_10, 0x00000300);
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mtsdram(DDR0_11, 0x000CC800);
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mtsdram(DDR0_12, 0x00000003);
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mtsdram(DDR0_14, 0x00000000);
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mtsdram(DDR0_17, 0x1e000000);
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mtsdram(DDR0_18, 0x1e1e1e1e);
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mtsdram(DDR0_19, 0x1e1e1e1e);
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mtsdram(DDR0_20, 0x0B0B0B0B);
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mtsdram(DDR0_21, 0x0B0B0B0B);
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#ifdef CONFIG_DDR_ECC
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mtsdram(DDR0_22, 0x00267F0B | DDR0_22_CTRL_RAW_ECC_ENABLE); /* enable ECC */
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#else
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mtsdram(DDR0_22, 0x00267F0B);
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#endif
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mtsdram(DDR0_23, 0x01000000);
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mtsdram(DDR0_24, 0x01010001);
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mtsdram(DDR0_26, 0x2D93028A);
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mtsdram(DDR0_27, 0x0784682B);
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mtsdram(DDR0_28, 0x00000080);
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mtsdram(DDR0_31, 0x00000000);
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mtsdram(DDR0_42, 0x01000006);
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mtsdram(DDR0_43, 0x030A0200);
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mtsdram(DDR0_44, 0x00000003);
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mtsdram(DDR0_02, 0x00000001); /* Activate the denali core */
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#else
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/* CL=4 */
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mtsdram(DDR0_02, 0x00000000);
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mtsdram(DDR0_00, 0x0000190A);
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mtsdram(DDR0_01, 0x01000000);
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mtsdram(DDR0_03, 0x02040803); /* A suitable burst length was taken. CAS is right for our board */
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mtsdram(DDR0_04, 0x0B030300);
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mtsdram(DDR0_05, 0x02020308);
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mtsdram(DDR0_06, 0x0003C812);
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mtsdram(DDR0_07, 0x00090100);
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mtsdram(DDR0_08, 0x03c80001);
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mtsdram(DDR0_09, 0x00011D5F);
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mtsdram(DDR0_10, 0x00000300);
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mtsdram(DDR0_11, 0x000CC800);
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mtsdram(DDR0_12, 0x00000003);
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mtsdram(DDR0_14, 0x00000000);
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mtsdram(DDR0_17, 0x1e000000);
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mtsdram(DDR0_18, 0x1e1e1e1e);
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mtsdram(DDR0_19, 0x1e1e1e1e);
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mtsdram(DDR0_20, 0x0B0B0B0B);
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mtsdram(DDR0_21, 0x0B0B0B0B);
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#ifdef CONFIG_DDR_ECC
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mtsdram(DDR0_22, 0x00267F0B | DDR0_22_CTRL_RAW_ECC_ENABLE); /* enable ECC */
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#else
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mtsdram(DDR0_22, 0x00267F0B);
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#endif
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mtsdram(DDR0_23, 0x01000000);
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mtsdram(DDR0_24, 0x01010001);
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mtsdram(DDR0_26, 0x2D93028A);
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mtsdram(DDR0_27, 0x0784682B);
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mtsdram(DDR0_28, 0x00000080);
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mtsdram(DDR0_31, 0x00000000);
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mtsdram(DDR0_42, 0x01000008);
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mtsdram(DDR0_43, 0x050A0200);
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mtsdram(DDR0_44, 0x00000005);
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mtsdram(DDR0_02, 0x00000001); /* Activate the denali core */
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#endif
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denali_wait_for_dlllock();
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#if defined(CONFIG_DDR_DATA_EYE)
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/* -----------------------------------------------------------+
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* Perform data eye search if requested.
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* ----------------------------------------------------------*/
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program_tlb(0, CFG_SDRAM_BASE, CFG_MBYTES_SDRAM << 20,
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TLB_WORD2_I_ENABLE);
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denali_core_search_data_eye();
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remove_tlb(CFG_SDRAM_BASE, CFG_MBYTES_SDRAM << 20);
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#endif
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/*
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* Program tlb entries for this size (dynamic)
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*/
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program_tlb(0, CFG_SDRAM_BASE, CFG_MBYTES_SDRAM << 20,
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MY_TLB_WORD2_I_ENABLE);
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/*
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* Setup 2nd TLB with same physical address but different virtual address
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* with cache enabled. This is done for fast ECC generation.
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*/
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program_tlb(0, CFG_DDR_CACHED_ADDR, CFG_MBYTES_SDRAM << 20, 0);
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#ifdef CONFIG_DDR_ECC
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/*
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* If ECC is enabled, initialize the parity bits.
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*/
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program_ecc(CFG_DDR_CACHED_ADDR, CFG_MBYTES_SDRAM << 20, 0);
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#endif
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/*
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* Clear possible errors resulting from data-eye-search.
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* If not done, then we could get an interrupt later on when
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* exceptions are enabled.
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*/
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set_mcsr(get_mcsr());
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return (CFG_MBYTES_SDRAM << 20);
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}
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