/* * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #include <common.h> #include <environment.h> #include <init.h> #include <asm/io.h> #include <mach/imx-regs.h> #if defined(CONFIG_ARCH_IMX25) || defined(CONFIG_ARCH_IMX35) /* * Saves the boot source media into the $barebox_loc enviroment variable * * This information is useful for barebox init scripts as we can then easily * use a kernel image stored on the same media that we launch barebox with * (for example). * * imx25 and imx35 can boot into barebox from several media such as * nand, nor, mmc/sd cards, serial roms. "mmc" is used to represent several * sources as its impossible to distinguish between them. * * Some sources such as serial roms can themselves have 3 different boot * possibilities (i2c1, i2c2 etc). It is assumed that any board will * only be using one of these at any one time. * * Note also that I suspect that the boot source pins are only sampled at * power up. */ static int imx_boot_save_loc(void) { const char *bareboxloc = NULL; uint32_t reg; unsigned int ctrl, type; /* [CTRL][TYPE] */ const char *const locations[4][4] = { { /* CTRL = WEIM */ "nor", NULL, "onenand", NULL, }, { /* CTRL == NAND */ "nand", "nand", "nand", "nand", }, { /* CTRL == ATA, (imx35 only) */ NULL, NULL, /* might be p-ata */ NULL, NULL, }, { /* CTRL == expansion */ "mmc", /* note imx25 could also be: movinand, ce-ata */ NULL, "i2c", "spi", } }; reg = readl(IMX_CCM_BASE + CCM_RCSR); ctrl = (reg >> CCM_RCSR_MEM_CTRL_SHIFT) & 0x3; type = (reg >> CCM_RCSR_MEM_TYPE_SHIFT) & 0x3; bareboxloc = locations[ctrl][type]; if (bareboxloc) { setenv("barebox_loc", bareboxloc); export("barebox_loc"); } return 0; } /* * This can only be called after env_push_context() has been called * so it is a late_initcall. */ late_initcall(imx_boot_save_loc); #endif