Commit b1c2a7ae authored by Gerlando Falauto's avatar Gerlando Falauto Committed by Albert ARIBAUD

arm/km: define fdt_high env variable and allow backwards compatibility

Add set_fdthigh subcommand to "subbootcmds" (release) so to set "fdt_high"
This is necessary on Kirkwood so that the FDT does not get relocated
above the memory limit that the kernel cannot access
(that is the memory part reserved for the switch).
This was tested on NUSA1, where it is necessary, and on ETER1, where it
doesn't seem to hurt.

We want the scripts to also work with older versions of u-boot, where:
a) set_fdthigh is not defined (will be default env for newer u-boots)
b) the fdt will not be available

For this reason, we use "set_fdthigh" to tell whether we are running
a newer (FDT-aware) u-boot or not.
So if "set_fdthigh" runs successfully or arch != arm we try loading
the fdt; otherwise we proceed normally.

Notice how, contrary to release mode, set_fdthigh will _not_ be part of
subbootcmds for develop and ramfs, but will be executed as part of

Since this is only needed for kirkwood cards, and it prevents the kernel
from booting on QorIQ (though it seemed to work on ETER1), we change
its definition in the default env for powerpc so that the value is only
set on ARM.
Signed-off-by: default avatarValentin Longchamp <>
Signed-off-by: default avatarGerlando Falauto <>
Signed-off-by: default avatarHolger Brunck <>
Acked-by: default avatarValentin Longchamp <>
parent 7b2268b8
......@@ -3,7 +3,7 @@ bootcmd=run ${subbootcmds}
configure=run set_uimage; km_setboardid && saveenv && reset
subbootcmds=tftpfdt tftpkernel nfsargs add_default boot
nfsargs=setenv bootargs root=/dev/nfs rw nfsroot=${serverip}:${toolchain}/${arch}
tftpfdt=tftpboot ${fdt_addr_r} ${hostname}/${hostname}.dtb
tftpfdt=if run set_fdthigh || test ${arch} != arm; then tftpboot ${fdt_addr_r} ${hostname}/${hostname}.dtb; else true; fi
tftpkernel=tftpboot ${load_addr_r} ${hostname}/${uimage}
......@@ -7,7 +7,7 @@ nfsargs=setenv bootargs root=/dev/nfs rw nfsroot=${serverip}:${rootpath}
configure=run set_uimage; km_setboardid && saveenv && reset
setrootfsaddr=setexpr value ${pnvramaddr} - ${rootfssize} && setenv rootfsaddr 0x${value}
tftpfdt=tftpboot ${fdt_addr_r} ${hostname}/${hostname}.dtb
tftpfdt=if run set_fdthigh || test ${arch} != arm; then tftpboot ${fdt_addr_r} ${hostname}/${hostname}.dtb; else true; fi
tftpkernel=tftpboot ${load_addr_r} ${hostname}/${uimage}
tftpramfs=tftpboot ${rootfsaddr} ${hostname}/rootfsImage
set_uimage=printenv uimage || setenv uimage uImage
......@@ -135,8 +135,8 @@
* - 'release': for a standalone system kernel/rootfs from flash
"subbootcmds=ubiattach ubicopy cramfsloadfdt cramfsloadkernel " \
"flashargs add_default addpanic boot\0" \
"subbootcmds=ubiattach ubicopy cramfsloadfdt set_fdthigh " \
"cramfsloadkernel flashargs add_default addpanic boot\0"\
"develop=" \
"tftp 200000 scripts/develop-${arch}.txt && " \
"env import -t 200000 ${filesize} && " \
......@@ -77,6 +77,7 @@
"cp.b ${load_addr_r} " __stringify(BOOTFLASH_START) \
" ${filesize} && " \
"protect on " __stringify(BOOTFLASH_START) " +${filesize}\0"\
"set_fdthigh=true\0" \
......@@ -81,6 +81,7 @@
"u-boot="__stringify(CONFIG_HOSTNAME) "/u-boot.kwb\0" \
"set_fdthigh=setenv fdt_high ${kernelmem}\0" \
#define CONFIG_SKIP_LOWLEVEL_INIT /* disable board lowlevel_init */
......@@ -420,6 +420,7 @@ unsigned long get_board_sys_clk(unsigned long dummy);
"update=" \
"sf probe 0;sf erase 0 +${filesize};" \
"sf write ${load_addr_r} 0 ${filesize};\0" \
"set_fdthigh=true\0" \
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