The MPC8536E is capable of booting form NAND/eSDHC/eSPI, this patch implements these three bootup methods in a unified way - all of these use the general cpu/mpc85xx/start.S, and load the main image to L2SRAM which lets us use the SPD to initialize the SDRAM. For all three bootup methods, the bootup process can be divided into two stages: the first stage will initialize the corresponding controller, configure the L2SRAM, then copy the second stage image to L2SRAM and jump to it. The second stage image is just like the general U-Boot image to configure all the hardware and boot up to U-Boot command line. When boot from NAND, the eLBC controller will first load the first stage image to internal 4K RAM buffer because it's also stored on the NAND flash. The first stage image, also call 4K NAND loader, will initialize the L2SRAM, load the second stage image to L2SRAM and jump to it. The 4K NAND loader's code comes from the corresponding nand_spl directory, along with the code twisted by CONFIG_NAND_SPL. When boot from eSDHC/eSPI, there's no such a first stage image because the CPU ROM code does the same work. It will initialize the L2SRAM according to the config addr/word pairs on the fixed address and initialize the eSDHC/eSPI controller, then load the second stage image to L2SRAM and jump to it. The macro CONFIG_SYS_RAMBOOT is used to control the code to produce the second stage image for all different bootup methods. It's set in the board config file when one of the bootup methods above is selected. Signed-off-by: Mingkai Hu <Mingkai.hu@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>master
Mingkai Hu
16 years ago
committed by
Tom Rix
parent
8d82308305
commit
9f3243612c
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/* |
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* Copyright 2009 Freescale Semiconductor, Inc. |
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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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OUTPUT_ARCH(powerpc) |
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/* Do we need any of these for elf? |
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__DYNAMIC = 0; */ |
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PHDRS |
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{ |
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text PT_LOAD; |
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bss PT_LOAD; |
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} |
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SECTIONS |
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{ |
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/* Read-only sections, merged into text segment: */ |
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. = + SIZEOF_HEADERS; |
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.interp : { *(.interp) } |
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.hash : { *(.hash) } |
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.dynsym : { *(.dynsym) } |
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.dynstr : { *(.dynstr) } |
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.rel.text : { *(.rel.text) } |
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.rela.text : { *(.rela.text) } |
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.rel.data : { *(.rel.data) } |
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.rela.data : { *(.rela.data) } |
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.rel.rodata : { *(.rel.rodata) } |
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.rela.rodata : { *(.rela.rodata) } |
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.rel.got : { *(.rel.got) } |
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.rela.got : { *(.rela.got) } |
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.rel.ctors : { *(.rel.ctors) } |
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.rela.ctors : { *(.rela.ctors) } |
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.rel.dtors : { *(.rel.dtors) } |
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.rela.dtors : { *(.rela.dtors) } |
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.rel.bss : { *(.rel.bss) } |
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.rela.bss : { *(.rela.bss) } |
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.rel.plt : { *(.rel.plt) } |
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.rela.plt : { *(.rela.plt) } |
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.init : { *(.init) } |
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.plt : { *(.plt) } |
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.text : |
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{ |
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*(.text) |
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*(.fixup) |
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*(.got1) |
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} :text |
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_etext = .; |
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PROVIDE (etext = .); |
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.rodata : |
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{ |
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*(.eh_frame) |
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*(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) |
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} :text |
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.fini : { *(.fini) } =0 |
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.ctors : { *(.ctors) } |
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.dtors : { *(.dtors) } |
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/* Read-write section, merged into data segment: */ |
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. = (. + 0x00FF) & 0xFFFFFF00; |
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_erotext = .; |
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PROVIDE (erotext = .); |
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.reloc : |
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{ |
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*(.got) |
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_GOT2_TABLE_ = .; |
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*(.got2) |
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_FIXUP_TABLE_ = .; |
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*(.fixup) |
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} |
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__got2_entries = (_FIXUP_TABLE_ - _GOT2_TABLE_) >> 2; |
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__fixup_entries = (. - _FIXUP_TABLE_) >> 2; |
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.data : |
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{ |
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*(.data) |
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*(.data1) |
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*(.sdata) |
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*(.sdata2) |
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*(.dynamic) |
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CONSTRUCTORS |
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} |
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_edata = .; |
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PROVIDE (edata = .); |
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. = .; |
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__u_boot_cmd_start = .; |
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.u_boot_cmd : { *(.u_boot_cmd) } |
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__u_boot_cmd_end = .; |
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. = .; |
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__start___ex_table = .; |
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__ex_table : { *(__ex_table) } |
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__stop___ex_table = .; |
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. = ALIGN(256); |
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__init_begin = .; |
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.text.init : { *(.text.init) } |
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.data.init : { *(.data.init) } |
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. = ALIGN(256); |
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__init_end = .; |
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.bootpg ADDR(.text) - 0x1000 : |
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{ |
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cpu/mpc85xx/start.o (.bootpg) |
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} :text = 0xffff |
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. = ADDR(.text) + 0x80000; |
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__bss_start = .; |
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.bss (NOLOAD) : |
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{ |
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*(.sbss) *(.scommon) |
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*(.dynbss) |
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*(.bss) |
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*(COMMON) |
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} :bss |
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. = ALIGN(4); |
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_end = . ; |
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PROVIDE (end = .); |
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} |
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