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https://github.com/brain-hackers/u-boot-brain
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72fb68d53c
Add board_flash_wp_on() to check a pca9557 gpio pin to see if non-volatile memory write protection is enabled. Previously, write protected NOR flashes would fail initialization which resulted in a bootup error such as: ... DTT: 53 C local / 64 C remote (adt7461@4c) DTT: 54 C local (ds1621@48) FLASH: Executed from FLASH1 POST memory PASSED FLASH: ## Unknown FLASH on Bank 1 - Size = 0x00000000 = 0 MB ## Unknown FLASH on Bank 2 - Size = 0x00000000 = 0 MB *** failed *** ### ERROR ### Please RESET the board ### With this patch, NOR flash initialization is skipped: ... DTT: 53 C local / 64 C remote (adt7461@4c) DTT: 54 C local (ds1621@48) FLASH: Executed from FLASH1 POST memory PASSED FLASH: Uninitialized - Write Protect On L2: 1024 KB enabled NAND: 1024 MiB ... Note that flash related commands such as flinfo and saveenv will error out when flash write protection is enabled. Signed-off-by: John Schmoller <jschmoller@xes-inc.com> Signed-off-by: Peter Tyser <ptyser@xes-inc.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/*
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* Copyright 2008 Extreme Engineering Solutions, 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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#include <common.h>
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#include <asm/mmu.h>
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#ifdef CONFIG_PCA953X
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#include <pca953x.h>
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/*
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* Determine if a board's flashes are write protected
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*/
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int board_flash_wp_on(void)
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{
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if (pca953x_get_val(CONFIG_SYS_I2C_PCA953X_ADDR0) &
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CONFIG_SYS_PCA953X_NVM_WP)
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return 1;
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return 0;
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}
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#endif
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/*
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* Return a board's derivative model number. For example:
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* return 2 for the XPedite5372 and return 1 for the XPedite5201.
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*/
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uint get_board_derivative(void)
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{
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#if defined(CONFIG_MPC85xx)
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volatile ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;
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#elif defined(CONFIG_MPC86xx)
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volatile immap_t *immap = (immap_t *)CONFIG_SYS_CCSRBAR;
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volatile ccsr_gur_t *gur = &immap->im_gur;
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#endif
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/*
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* The top 4 lines of the local bus address are pulled low/high and
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* can be read to determine the least significant digit of a board's
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* model number.
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*/
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return gur->gpporcr >> 28;
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}
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