The U-Boot documentation explains that variables ending with "_r" hold addresses in DRAM, while those without that ending point to flash/ROM. The default variables for the Juno board pointing to the kernel and DTB load addresses were not complying with this scheme: they lack the extension, but point to DRAM. This is particularly confusing since the Juno board features parallel NOR flash, so there *is* a memory mapped NOR address holding a DTB, for instance.
Fix the variables to use the proper names, changing initrd_addr to ramdisk_addr_r on the way, which seems to be more prevelant and documented. On the way adjust the FDT load address to be situated *before* the kernel, since users happened to overwrite the DTB by the kernel clearing its .BSS section during initialisation. Also remove the fdt_high and initrd_high variables (which were set to -1), to allow U-Boot moving those images around.
This should avoid many problems in the future, but breaks loading Linux kernels < v4.2, since they expect the DTB to be loaded in the same 512MB region as the kernel. If you need to load such an old kernel, please set fdt_high to either 0xffffffffffffffff or 0xa0000000 (if you load the kernel to the beginning of DRAM).
That fixes loading debug kernels, which happened to overwrite the DTB on certain setups.
Signed-off-by: Andre Przywara andre.przywara@arm.com --- include/configs/vexpress_aemv8a.h | 28 +++++++++++++--------------- 1 file changed, 13 insertions(+), 15 deletions(-)
diff --git a/include/configs/vexpress_aemv8a.h b/include/configs/vexpress_aemv8a.h index 4f3a792f49..6f81760612 100644 --- a/include/configs/vexpress_aemv8a.h +++ b/include/configs/vexpress_aemv8a.h @@ -138,35 +138,33 @@ #define CONFIG_EXTRA_ENV_SETTINGS \ "kernel_name=norkern\0" \ "kernel_alt_name=Image\0" \ - "kernel_addr=0x80080000\0" \ - "initrd_name=ramdisk.img\0" \ - "initrd_addr=0x84000000\0" \ + "kernel_addr_r=0x80080000\0" \ + "ramdisk_name=ramdisk.img\0" \ + "ramdisk_addr_r=0x88000000\0" \ "fdtfile=board.dtb\0" \ "fdt_alt_name=juno\0" \ - "fdt_addr=0x83000000\0" \ - "fdt_high=0xffffffffffffffff\0" \ - "initrd_high=0xffffffffffffffff\0" \ + "fdt_addr_r=0x80000000\0" \
/* Copy the kernel and FDT to DRAM memory and boot */ -#define CONFIG_BOOTCOMMAND "afs load ${kernel_name} ${kernel_addr} ; " \ +#define CONFIG_BOOTCOMMAND "afs load ${kernel_name} ${kernel_addr_r} ;"\ "if test $? -eq 1; then "\ " echo Loading ${kernel_alt_name} instead of "\ "${kernel_name}; "\ - " afs load ${kernel_alt_name} ${kernel_addr};"\ + " afs load ${kernel_alt_name} ${kernel_addr_r};"\ "fi ; "\ - "afs load ${fdtfile} ${fdt_addr} ; " \ + "afs load ${fdtfile} ${fdt_addr_r} ;"\ "if test $? -eq 1; then "\ " echo Loading ${fdt_alt_name} instead of "\ "${fdtfile}; "\ - " afs load ${fdt_alt_name} ${fdt_addr}; "\ + " afs load ${fdt_alt_name} ${fdt_addr_r}; "\ "fi ; "\ - "fdt addr ${fdt_addr}; fdt resize; " \ - "if afs load ${initrd_name} ${initrd_addr} ; "\ + "fdt addr ${fdt_addr_r}; fdt resize; " \ + "if afs load ${ramdisk_name} ${ramdisk_addr_r} ; "\ "then "\ - " setenv initrd_param ${initrd_addr}; "\ - " else setenv initrd_param -; "\ + " setenv ramdisk_param ${ramdisk_addr_r}; "\ + " else setenv ramdisk_param -; "\ "fi ; " \ - "booti ${kernel_addr} ${initrd_param} ${fdt_addr}" + "booti ${kernel_addr_r} ${ramdisk_param} ${fdt_addr_r}"
#elif CONFIG_TARGET_VEXPRESS64_BASE_FVP