Vladimir Serbinenko (phcoder@gmail.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/13754
-gerrit
commit f632e97fa49d61a318f48a02e8e46b5a6a786f4d Author: Vladimir Serbinenko phcoder@gmail.com Date: Fri Feb 19 22:50:50 2016 +0100
qemu/vexpress-a9: Discover RAM size.
Probe RAM to find its size instead of hardcoding 1024M. Also properly export it to memory map.
Change-Id: Ib411f0a068bd247a9e0cd0a59689a3896921483e Signed-off-by: Vladimir Serbinenko phcoder@gmail.com --- src/mainboard/emulation/qemu-armv7/Kconfig | 4 --- src/mainboard/emulation/qemu-armv7/cbmem.c | 42 +++++++++++++++++++++++++- src/mainboard/emulation/qemu-armv7/mainboard.c | 39 ++++++++++++++++++++++++ src/mainboard/emulation/qemu-armv7/mainboard.h | 21 +++++++++++++ 4 files changed, 101 insertions(+), 5 deletions(-)
diff --git a/src/mainboard/emulation/qemu-armv7/Kconfig b/src/mainboard/emulation/qemu-armv7/Kconfig index 2654f0f..f30dcd1 100644 --- a/src/mainboard/emulation/qemu-armv7/Kconfig +++ b/src/mainboard/emulation/qemu-armv7/Kconfig @@ -48,8 +48,4 @@ config MAINBOARD_VENDOR string default "ARM Ltd."
-config DRAM_SIZE_MB - int - default 1024 - endif # BOARD_EMULATION_QEMU_ARMV7 diff --git a/src/mainboard/emulation/qemu-armv7/cbmem.c b/src/mainboard/emulation/qemu-armv7/cbmem.c index a626ec6..b634bf6 100644 --- a/src/mainboard/emulation/qemu-armv7/cbmem.c +++ b/src/mainboard/emulation/qemu-armv7/cbmem.c @@ -14,8 +14,48 @@ #include <stddef.h> #include <cbmem.h> #include <symbols.h> +#include "mainboard.h" + +/* Returns 1 if megabyte mb is present and 0 otherwise. */ +static int probe_mb(int mb) +{ + volatile char *ptr = (char *) 0x60000000 + (mb << 20) + 0xfffff; + char old; + if (ptr < (volatile char *) &_eprogram) { + /* Don't probe below _end to avoid accidentally clobering + oneself. + */ + return 1; + } + + old = *ptr; + *ptr = 0x55; + if (*ptr != 0x55) + return 0; + *ptr = 0xaa; + if (*ptr != 0xaa) + return 0; + *ptr = old; + return 1; +} + +int probe_ramsize(void) +{ + int i; + int discovered = 0; + static int saved_result; + if (saved_result) + return saved_result; + /* Compact binary search. */ + for (i = 9; i >= 0; i--) + if (probe_mb(discovered | (1 << i))) + discovered |= (1 << i); + discovered++; + saved_result = discovered; + return discovered; +}
void *cbmem_top(void) { - return _dram + (CONFIG_DRAM_SIZE_MB << 20); + return _dram + (probe_ramsize() << 20); } diff --git a/src/mainboard/emulation/qemu-armv7/mainboard.c b/src/mainboard/emulation/qemu-armv7/mainboard.c new file mode 100644 index 0000000..a5ae0d0 --- /dev/null +++ b/src/mainboard/emulation/qemu-armv7/mainboard.c @@ -0,0 +1,39 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2016 Vladimir Serbinenko phcoder@gmail.com + * + * 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; version 2 or, at your option, any later + * version of the License. + * + * 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. + */ + +#include <console/console.h> +#include <device/device.h> +#include <cbmem.h> +#include <string.h> +#include "mainboard.h" + +static void mainboard_enable(device_t dev) +{ + int discovered; + if (!dev) { + printk(BIOS_EMERG, "No dev0; die\n"); + while (1); + } + + discovered = probe_ramsize(); + printk(BIOS_DEBUG, "%d MiB of RAM discovered\n", discovered); + ram_resource(dev, 0, 0x60000000 >> 10, discovered << 10); + cbmem_recovery(0); +} + +struct chip_operations mainboard_ops = { + .enable_dev = mainboard_enable, +}; diff --git a/src/mainboard/emulation/qemu-armv7/mainboard.h b/src/mainboard/emulation/qemu-armv7/mainboard.h new file mode 100644 index 0000000..3691c36 --- /dev/null +++ b/src/mainboard/emulation/qemu-armv7/mainboard.h @@ -0,0 +1,21 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2016 Vladimir Serbinenko phcoder@gmail.com + * + * 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; version 2 or, at your option, any later + * version of the License. + * + * 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. + */ + +#ifndef QEMU_ARMV7_MAINBOARD_H +#define QEMU_ARMV7_MAINBOARD_H + +int probe_ramsize(void); +#endif