+/* SPDX-License-Identifier: GPL-2.0 */
/*
* (C) Copyright 2012-2016 Stephen Warren
- *
- * SPDX-License-Identifier: GPL-2.0
*/
#ifndef __CONFIG_H
#endif
/* Memory layout */
-#define CONFIG_NR_DRAM_BANKS 1
#define CONFIG_SYS_SDRAM_BASE 0x00000000
-#ifdef CONFIG_ARM64
-#define CONFIG_SYS_TEXT_BASE 0x00080000
-#else
-#define CONFIG_SYS_TEXT_BASE 0x00008000
-#endif
#define CONFIG_SYS_UBOOT_BASE CONFIG_SYS_TEXT_BASE
/*
* The board really has 256M. However, the VC (VideoCore co-processor) shares
#define CONFIG_VIDEO_BCM2835
#ifdef CONFIG_CMD_USB
-#define CONFIG_USB_HOST_ETHER
-#define CONFIG_USB_ETHER_SMSC95XX
#define CONFIG_TFTP_TSIZE
#define CONFIG_MISC_INIT_R
-#define CONFIG_SYS_USB_EVENT_POLL
-#endif
-
-/* Console UART */
-#ifdef CONFIG_BCM2837
-#define CONFIG_BCM283X_MU_SERIAL
-#else
-#define CONFIG_PL01X_SERIAL
#endif
/* Console configuration */
#define CONFIG_SYS_CBSIZE 1024
-#define CONFIG_SYS_PBSIZE (CONFIG_SYS_CBSIZE + \
- sizeof(CONFIG_SYS_PROMPT) + 16)
/* Environment */
#define CONFIG_ENV_SIZE SZ_16K
-#define CONFIG_ENV_IS_IN_FAT
-#define FAT_ENV_INTERFACE "mmc"
-#define FAT_ENV_DEVICE_AND_PART "0:1"
-#define FAT_ENV_FILE "uboot.env"
-#define CONFIG_ENV_VARS_UBOOT_CONFIG
#define CONFIG_SYS_LOAD_ADDR 0x1000000
#define CONFIG_PREBOOT "usb start"
/* Shell */
-#define CONFIG_SYS_MAXARGS 16
-#define CONFIG_CMDLINE_EDITING
/* ATAGs support for bootm/bootz */
#define CONFIG_SETUP_MEMORY_TAGS
#define CONFIG_CMDLINE_TAG
#define CONFIG_INITRD_TAG
-#include <config_distro_defaults.h>
-
/* Environment */
-#define CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
#define ENV_DEVICE_SETTINGS \
"stdin=serial,usbkbd\0" \
"stdout=serial,vidconsole\0" \
"stderr=serial,vidconsole\0"
+#ifdef CONFIG_ARM64
+#define FDT_HIGH "ffffffffffffffff"
+#define INITRD_HIGH "ffffffffffffffff"
+#else
+#define FDT_HIGH "ffffffff"
+#define INITRD_HIGH "ffffffff"
+#endif
+
/*
* Memory layout for where various images get loaded by boot scripts:
*
* I suspect address 0 is used as the SMP pen on the RPi2, so avoid this.
*
- * fdt_addr_r simply shouldn't overlap anything else. However, the RPi's
- * binary firmware loads a DT to address 0x100, so we choose this address to
- * match it. This allows custom boot scripts to pass this DT on to Linux
- * simply by not over-writing the data at this address. When using U-Boot,
- * U-Boot (and scripts it executes) typicaly ignore the DT loaded by the FW
- * and loads its own DT from disk (triggered by boot.scr or extlinux.conf).
+ * Older versions of the boot firmware place the firmware-loaded DTB at 0x100,
+ * newer versions place it in high memory. So prevent U-Boot from doing its own
+ * DTB + initrd relocation so that we won't accidentally relocate the initrd
+ * over the firmware-loaded DTB and generally try to lay out things starting
+ * from the bottom of RAM.
*
- * pxefile_addr_r can be pretty much anywhere that doesn't conflict with
- * something else. Put it low in memory to avoid conflicts.
+ * kernel_addr_r has different constraints on ARM and Aarch64. For 32-bit ARM,
+ * it must be within the first 128M of RAM in order for the kernel's
+ * CONFIG_AUTO_ZRELADDR option to work. The kernel itself will be decompressed
+ * to 0x8000 but the decompressor clobbers 0x4000-0x8000 as well. The
+ * decompressor also likes to relocate itself to right past the end of the
+ * decompressed kernel, so in total the sum of the compressed and and
+ * decompressed kernel needs to be reserved.
*
- * kernel_addr_r must be within the first 128M of RAM in order for the
- * kernel's CONFIG_AUTO_ZRELADDR option to work. Since the kernel will
- * decompress itself to 0x8000 after the start of RAM, kernel_addr_r
- * should not overlap that area, or the kernel will have to copy itself
- * somewhere else before decompression. Similarly, the address of any other
- * data passed to the kernel shouldn't overlap the start of RAM. Pushing
- * this up to 16M allows for a sizable kernel to be decompressed below the
- * compressed load address.
+ * For Aarch64, the kernel image is uncompressed and must be loaded at
+ * text_offset bytes (specified in the header of the Image) into a 2MB
+ * boundary. The 'booti' command relocates the image if necessary. Linux uses
+ * a default text_offset of 0x80000. In summary, loading at 0x80000
+ * satisfies all these constraints and reserving memory up to 0x02400000
+ * permits fairly large (roughly 36M) kernels.
*
- * scriptaddr can be pretty much anywhere that doesn't conflict with something
- * else. Choosing 32M allows for the compressed kernel to be up to 16M.
+ * scriptaddr and pxefile_addr_r can be pretty much anywhere that doesn't
+ * conflict with something else. Reserving 1M for each of them at
+ * 0x02400000-0x02500000 and 0x02500000-0x02600000 should be plenty.
*
- * ramdisk_addr_r simply shouldn't overlap anything else. Choosing 33M allows
- * for any boot script to be up to 1M, which is hopefully plenty.
+ * On ARM, both the DTB and any possible initrd must be loaded such that they
+ * fit inside the lowmem mapping in Linux. In practice, this usually means not
+ * more than ~700M away from the start of the kernel image but this number can
+ * be larger OR smaller depending on e.g. the 'vmalloc=xxxM' command line
+ * parameter given to the kernel. So reserving memory from low to high
+ * satisfies this constraint again. Reserving 1M at 0x02600000-0x02700000 for
+ * the DTB leaves rest of the free RAM to the initrd starting at 0x02700000.
+ * Even with the smallest possible CPU-GPU memory split of the CPU getting
+ * only 64M, the remaining 25M starting at 0x02700000 should allow quite
+ * large initrds before they start colliding with U-Boot.
*/
#define ENV_MEM_LAYOUT_SETTINGS \
- "fdt_high=ffffffff\0" \
- "initrd_high=ffffffff\0" \
- "fdt_addr_r=0x00000100\0" \
- "pxefile_addr_r=0x00100000\0" \
- "kernel_addr_r=0x01000000\0" \
- "scriptaddr=0x02000000\0" \
- "ramdisk_addr_r=0x02100000\0" \
+ "fdt_high=" FDT_HIGH "\0" \
+ "initrd_high=" INITRD_HIGH "\0" \
+ "kernel_addr_r=0x00080000\0" \
+ "scriptaddr=0x02400000\0" \
+ "pxefile_addr_r=0x02500000\0" \
+ "fdt_addr_r=0x02600000\0" \
+ "ramdisk_addr_r=0x02700000\0"
#define BOOT_TARGET_DEVICES(func) \
func(MMC, mmc, 0) \
projects / platform / kernel / u-boot.git / blobdiff