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authorVladimir Serbinenko <phcoder@gmail.com>2016-02-19 22:50:50 +0100
committerVladimir Serbinenko <phcoder@gmail.com>2017-05-12 15:49:46 +0200
commit77231330739962e4a76ae23f42a840558a0c675f (patch)
treeb5bf3fd0aa4be10029a81e212d12f681298d5be9 /src/mainboard/emulation
parentb3456a9e8059ddbaba6cab9caf47d6330d2e3a9c (diff)
downloadcoreboot-77231330739962e4a76ae23f42a840558a0c675f.tar.xz
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> Reviewed-on: https://review.coreboot.org/13754 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Diffstat (limited to 'src/mainboard/emulation')
-rw-r--r--src/mainboard/emulation/qemu-armv7/Kconfig4
-rw-r--r--src/mainboard/emulation/qemu-armv7/cbmem.c46
-rw-r--r--src/mainboard/emulation/qemu-armv7/mainboard.c40
-rw-r--r--src/mainboard/emulation/qemu-armv7/mainboard.h23
4 files changed, 108 insertions, 5 deletions
diff --git a/src/mainboard/emulation/qemu-armv7/Kconfig b/src/mainboard/emulation/qemu-armv7/Kconfig
index f7c4b2d862..76bdb321ea 100644
--- a/src/mainboard/emulation/qemu-armv7/Kconfig
+++ b/src/mainboard/emulation/qemu-armv7/Kconfig
@@ -49,8 +49,4 @@ 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 a626ec6adf..f26ca6cd20 100644
--- a/src/mainboard/emulation/qemu-armv7/cbmem.c
+++ b/src/mainboard/emulation/qemu-armv7/cbmem.c
@@ -14,8 +14,52 @@
#include <stddef.h>
#include <cbmem.h>
#include <symbols.h>
+#include <arch/io.h>
+#include "mainboard.h"
+
+#define PATTERN1 0x55
+#define PATTERN2 0xaa
+
+/* Returns 1 if mebibyte mb is present and 0 otherwise. */
+static int probe_mb(int mb)
+{
+ char *ptr = (char *) 0x60000000 + (mb << 20) + 0xfffff;
+ char old;
+ if (ptr < (char *) &_eprogram) {
+ /* Don't probe below _end to avoid accidentally clobering
+ oneself. */
+ return 1;
+ }
+
+ old = read8(ptr);
+ write8(ptr, PATTERN1);
+ if (read8(ptr) != PATTERN1)
+ return 0;
+ write8(ptr, PATTERN2);
+ if (read8(ptr) != PATTERN2)
+ return 0;
+ write8(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. */
+ /* 1 GiB is the largest supported RAM by this machine. */
+ 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 0000000000..eced9ae3b9
--- /dev/null
+++ b/src/mainboard/emulation/qemu-armv7/mainboard.c
@@ -0,0 +1,40 @@
+/*
+ * 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 <halt.h>
+#include "mainboard.h"
+
+static void mainboard_enable(device_t dev)
+{
+ int discovered;
+ if (!dev) {
+ printk(BIOS_EMERG, "No dev0; die\n");
+ halt();
+ }
+
+ 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 0000000000..87fa3beee6
--- /dev/null
+++ b/src/mainboard/emulation/qemu-armv7/mainboard.h
@@ -0,0 +1,23 @@
+/*
+ * 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
+
+/* Returns RAM size in mebibytes. */
+int probe_ramsize(void);
+
+#endif