From 767cb74a0028be337d2ffecee7450e83fa2e7bd1 Mon Sep 17 00:00:00 2001 From: Anatolij Gustschin Date: Thu, 17 Aug 2017 21:01:48 +0200 Subject: [PATCH] cmd: spl: provide address and size of prepared FDT in environment Writing prepared FDT to persistent storage should be possible in scripts. Create environment variables containing address and size of the updated FDT. Scripts can use these variables after running 'spl export fdt ...' command to write the new blob to persistent storage. Signed-off-by: Anatolij Gustschin --- cmd/spl.c | 5 +++++ doc/README.falcon | 7 ++++++- 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/cmd/spl.c b/cmd/spl.c index 057764a..1165b78 100644 --- a/cmd/spl.c +++ b/cmd/spl.c @@ -118,6 +118,11 @@ static int spl_export(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) case SPL_EXPORT_FDT: printf("Argument image is now in RAM: 0x%p\n", (void *)images.ft_addr); + env_set_addr("fdtargsaddr", images.ft_addr); + env_set_hex("fdtargslen", fdt_totalsize(images.ft_addr)); + if (fdt_totalsize(images.ft_addr) > + CONFIG_CMD_SPL_WRITE_SIZE) + puts("WARN: FDT size > CMD_SPL_WRITE_SIZE\n"); break; #endif case SPL_EXPORT_ATAGS: diff --git a/doc/README.falcon b/doc/README.falcon index e9f8a75..9a7f0bc 100644 --- a/doc/README.falcon +++ b/doc/README.falcon @@ -118,7 +118,12 @@ after each run of 'spl export'. Unfortunately the position of temporary storage can not be predicted nor provided at commandline, it depends highly on your system setup and your provided data (ATAGS or FDT). However at the end of an succesful 'spl export' run it will print the -RAM address of temporary storage. +RAM address of temporary storage. The RAM address of FDT will also be +set in the environment variable 'fdtargsaddr', the new length of the +prepared FDT will be set in the environment variable 'fdtargslen'. +These environment variables can be used in scripts for writing updated +FDT to persistent storage. + Now the user have to save the generated BLOB from that printed address to the pre-defined address in persistent storage (CONFIG_CMD_SPL_NAND_OFS in case of NAND).