mirror of
https://github.com/AsahiLinux/u-boot
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3fd673cf36
The current situation has the 64MB user flash at an awkward alignment; shifted back from 0xfc00_0000 by 8M, to leave an 8MB hole for the soldered on boot flash @ EOM. But to switch to optionally supporting booting off the 64MB flash, the 64MB will then be mapped at the sane address of 0xfc00_0000. This leads to awkward things when programming the 64MB flash prior to transitioning to it -- i.e. even though the chip spans from 0xfb80_0000 to 0xff7f_ffff, you would have to program a u-boot image into the two sectors from 0xfbf0_0000 --> 0xfbff_ffff so that it was in the right place when JP12/SW2.8 were switched to make the 64MB on /CS0. (i.e. the chip is only looking at the bits in mask 0x3ff_ffff) We also have to have three TLB entries responsible for dealing with mapping the 64MB flash due to this 8MB of misalignment. In the end, there is address space from 0xec00_0000 to 0xefff_ffff where we can map it, and then the transition from booting from one config to the other will be a simple 0xec --> 0xfc mapping. Plus we can toss out a TLB entry. Note that TLB0 is kept at 64MB and not shrunk down to the 8MB boot flash; this means we won't have to change it when the alternate config uses the full 64MB for booting, in TLB0. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
58 lines
1.9 KiB
C
58 lines
1.9 KiB
C
/*
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* Copyright 2008 Freescale Semiconductor, Inc.
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*
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* (C) Copyright 2000
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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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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#include <common.h>
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#include <asm/fsl_law.h>
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#include <asm/mmu.h>
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/*
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* LAW(Local Access Window) configuration:
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*
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* 0x0000_0000 0x0fff_ffff DDR 256M
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* 0x8000_0000 0x9fff_ffff PCI1 MEM 512M
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* 0xa000_0000 0xbfff_ffff PCIe MEM 512M
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* 0xe000_0000 0xe000_ffff CCSR 1M
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* 0xe200_0000 0xe27f_ffff PCI1 IO 8M
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* 0xe280_0000 0xe2ff_ffff PCIe IO 8M
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* 0xec00_0000 0xefff_ffff FLASH (2nd bank) 64M
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* 0xf000_0000 0xf7ff_ffff SDRAM 128M
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* 0xf8b0_0000 0xf80f_ffff EEPROM 1M
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* 0xff80_0000 0xffff_ffff FLASH (boot bank) 8M
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*
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* Notes:
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* CCSRBAR and L2-as-SRAM don't need a configured Local Access Window.
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* If flash is 8M at default position (last 8M), no LAW needed.
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*/
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struct law_entry law_table[] = {
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SET_LAW(CONFIG_SYS_ALT_FLASH, LAW_SIZE_64M, LAW_TRGT_IF_LBC),
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#ifndef CONFIG_SPD_EEPROM
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SET_LAW(CONFIG_SYS_DDR_SDRAM_BASE, LAW_SIZE_256M, LAW_TRGT_IF_DDR),
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#endif
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/* LBC window - maps 256M 0xf0000000 -> 0xffffffff */
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SET_LAW(CONFIG_SYS_LBC_SDRAM_BASE, LAW_SIZE_256M, LAW_TRGT_IF_LBC),
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};
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int num_law_entries = ARRAY_SIZE(law_table);
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