km/scripts: product env and auto-reset for ramfs

This patch adds the possibility in both debug and ramfs modes to
optionally load an env file from /tftpboot/$tftppath (this is ignored if
not present, so the change is backward compatible). This gives the debug
and ramfs scripts the possibility to set uboot environment variables
that were previously asked the users to manually set (nfs path in debug
and rootfs size in ramfs).

Signed-off-by: Holger Brunck <holger.brunck@ch.abb.com>
CC: Tom Rini <trini@konsulko.com>
diff --git a/board/keymile/scripts/develop-common.txt b/board/keymile/scripts/develop-common.txt
index ba15323..f77a26a 100644
--- a/board/keymile/scripts/develop-common.txt
+++ b/board/keymile/scripts/develop-common.txt
@@ -1,6 +1,6 @@
 altbootcmd=run ${subbootcmds}
 bootcmd=run ${subbootcmds}
-configure=run set_uimage; run set_tftppath; km_setboardid && saveenv && reset
+configure=run set_uimage; run set_tftppath; km_setboardid && run try_import_nfs_path && saveenv && reset
 subbootcmds=tftpfdt tftpkernel nfsargs add_default boot
 nfsargs=setenv bootargs root=/dev/nfs rw nfsroot=${serverip}:${toolchain}/${arch}
 tftpfdt=if run set_fdthigh || test ${arch} != arm; then if tftpboot ${fdt_addr_r} ${tftppath}/fdt_0x${IVM_BoardId}_0x${IVM_HWKey}.dtb; then; else tftpboot ${fdt_addr_r} ${tftppath}/${hostname}.dtb; fi; else true; fi
@@ -9,3 +9,4 @@
 rootfssize=0
 set_uimage=printenv uimage || setenv uimage uImage
 set_tftppath=if test ${hostname} = kmcoge5un; then setenv tftppath CI5UN; else if test ${hostname} = kmcoge5ne; then setenv tftppath CI5NE; else setenv tftppath ${IVM_Symbol}; fi; fi
+try_import_nfs_path=if tftpboot 0x200000 ${tftppath}/nfs-path.txt; then env import -t 0x200000 ${filesize}; else echo no auto nfs path imported; echo you can set nfsargs in /tftpboot/${tftppath}/nfs-path.txt and rerun develop; fi