cmd: spl: Remove ATAG support from this command

While we continue to have some systems which support extremely legacy
OS booting methods, we do not have use cases for supporting this in
Falcon mode anymore. Remove this support and references from the
documentation.

Co-developed-by: Anshul Dalal <anshuld@ti.com>
Signed-off-by: Tom Rini <trini@konsulko.com>

1 files changed, 7 insertions, 77 deletions

diff --git a/doc/develop/falcon.rst b/doc/develop/falcon.rst
index 244b4ccb5c2..5689d5b93a7 100644
--- a/doc/develop/falcon.rst
+++ b/doc/develop/falcon.rst
@@ -22,7 +22,7 @@ copies U-Boot image into the memory.
 
 The Falcon Mode extends this way allowing to start the Linux kernel directly
 from SPL. A new command is added to U-Boot to prepare the parameters that SPL
-must pass to the kernel, using ATAGS or Device Tree.
+must pass to the kernel using a Device Tree.
 
 In normal mode, these parameters are generated each time before
 loading the kernel, passing to Linux the address in memory where
@@ -117,10 +117,7 @@ spl - SPL configuration
 
 Usage::
 
-    spl export <img=atags|fdt> [kernel_addr] [initrd_addr] [fdt_addr ]
-
-img
-    "atags" or "fdt"
+    spl export fdt [kernel_addr] [initrd_addr] [fdt_addr ]
 
 kernel_addr
     kernel is loaded as part of the boot process, but it is not started.
@@ -134,11 +131,11 @@ fdt_addr
     in case of fdt, the address of the device tree.
 
 The *spl export* command does not write to a storage media. The user is
-responsible to transfer the gathered information (assembled ATAGS list
-or prepared FDT) from temporary storage in RAM into persistent storage
-after each run of *spl export*. Unfortunately the position of temporary
-storage can not be predicted nor provided at command line, it depends
-highly on your system setup and your provided data (ATAGS or FDT).
+responsible to transfer the gathered information (prepared FDT) from temporary
+storage in RAM into persistent storage after each run of *spl export*.
+Unfortunately the position of temporary storage can not be predicted nor
+provided at command line, it depends highly on your system setup and your
+provided device tree.
 However at the end of an successful *spl export* run it will print the
 RAM address of temporary storage. The RAM address of FDT will also be
 set in the environment variable *fdtargsaddr*, the new length of the
@@ -152,73 +149,6 @@ to the pre-defined address in persistent storage
 The following example shows how to prepare the data for Falcon Mode on
 twister board with ATAGS BLOB.
 
-The *spl export* command is prepared to work with ATAGS and FDT. However,
-using FDT is at the moment untested. The ppc port (see a3m071 example
-later) prepares the fdt blob with the fdt command instead.
-
-
-Usage on the twister board
---------------------------
-
-Using mtd names with the following (default) configuration
-for mtdparts::
-
-    device nand0 <omap2-nand.0>, # parts = 9
-     #: name        size        offset      mask_flags
-     0: MLO                 0x00080000      0x00000000      0
-     1: u-boot              0x00100000      0x00080000      0
-     2: env1                0x00040000      0x00180000      0
-     3: env2                0x00040000      0x001c0000      0
-     4: kernel              0x00600000      0x00200000      0
-     5: bootparms           0x00040000      0x00800000      0
-     6: splashimg           0x00200000      0x00840000      0
-     7: mini                0x02800000      0x00a40000      0
-     8: rootfs              0x1cdc0000      0x03240000      0
-
-::
-
-    twister => nand read 82000000 kernel
-
-    NAND read: device 0 offset 0x200000, size 0x600000
-    6291456 bytes read: OK
-
-Now the kernel is in RAM at address 0x82000000::
-
-    twister => spl export atags 0x82000000
-    ## Booting kernel from Legacy Image at 82000000 ...
-       Image Name:   Linux-3.5.0-rc4-14089-gda0b7f4
-       Image Type:   ARM Linux Kernel Image (uncompressed)
-       Data Size:    3654808 Bytes = 3.5 MiB
-       Load Address: 80008000
-       Entry Point:  80008000
-       Verifying Checksum ... OK
-       Loading Kernel Image ... OK
-    OK
-    cmdline subcommand not supported
-    bdt subcommand not supported
-    Argument image is now in RAM at: 0x80000100
-
-The result can be checked at address 0x80000100::
-
-    twister => md 0x80000100
-    80000100: 00000005 54410001 00000000 00000000    ......AT........
-    80000110: 00000000 00000067 54410009 746f6f72    ....g.....ATroot
-    80000120: 65642f3d 666e2f76 77722073 73666e20    =/dev/nfs rw nfs
-
-The parameters generated with this step can be saved into NAND at the offset
-0x800000 (value for twister for CONFIG_CMD_SPL_NAND_OFS)::
-
-    nand erase.part bootparms
-    nand write 0x80000100 bootparms 0x4000
-
-Now the parameters are stored into the NAND flash at the address
-CONFIG_CMD_SPL_NAND_OFS (=0x800000).
-
-Next time, the board can be started into Falcon Mode moving the
-setting the GPIO (on twister GPIO 55 is used) to kernel mode.
-
-The kernel is loaded directly by the SPL without passing through U-Boot.
-
 Example with FDT: a3m071 board
 ------------------------------