[PATCH] cmd: spl: Remove ATAG support from this command
Tom Rini
trini at konsulko.com
Mon Sep 15 21:05:48 CEST 2025
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.
Signed-off-by: Tom Rini <trini at konsulko.com>
---
cmd/spl.c | 18 ---------
doc/README.commands.spl | 14 ++-----
doc/develop/falcon.rst | 84 ++++-------------------------------------
include/cmd_spl.h | 3 +-
4 files changed, 11 insertions(+), 108 deletions(-)
diff --git a/cmd/spl.c b/cmd/spl.c
index 379b512f1ffd..90193b43abf4 100644
--- a/cmd/spl.c
+++ b/cmd/spl.c
@@ -27,19 +27,6 @@ static const char **subcmd_list[] = {
"cmdline",
"bdt",
"prep",
-#endif
- NULL,
- },
- [SPL_EXPORT_ATAGS] = (const char * []) {
-#ifdef CONFIG_SUPPORT_PASSING_ATAGS
- "start",
- "loados",
-#ifdef CONFIG_SYS_BOOT_RAMDISK_HIGH
- "ramdisk",
-#endif
- "cmdline",
- "bdt",
- "prep",
#endif
NULL,
},
@@ -96,7 +83,6 @@ static int call_bootm(int argc, char *const argv[], const char *subcommand[])
static struct cmd_tbl cmd_spl_export_sub[] = {
U_BOOT_CMD_MKENT(fdt, 0, 1, (void *)SPL_EXPORT_FDT, "", ""),
- U_BOOT_CMD_MKENT(atags, 0, 1, (void *)SPL_EXPORT_ATAGS, "", ""),
};
static int spl_export(struct cmd_tbl *cmdtp, int flag, int argc,
@@ -128,10 +114,6 @@ static int spl_export(struct cmd_tbl *cmdtp, int flag, int argc,
#endif
break;
#endif
- case SPL_EXPORT_ATAGS:
- printf("Argument image is now in RAM at: 0x%p\n",
- (void *)gd->bd->bi_boot_params);
- break;
}
} else {
/* Unrecognized command */
diff --git a/doc/README.commands.spl b/doc/README.commands.spl
index ecfd3ca9ee58..54cc5b1ec421 100644
--- a/doc/README.commands.spl
+++ b/doc/README.commands.spl
@@ -5,24 +5,16 @@ SUBCOMMAND EXPORT
To execute the command everything has to be in place as if bootm should be
used. (kernel image, initrd-image, fdt-image etc.)
-export has two subcommands:
- atags: exports the ATAGS
+export has one subcommand:
fdt: exports the FDT
Call is:
-spl export <fdt|atags> [kernel_addr] [initrd_addr] [fdt_addr if fdt]
+spl export fdt [kernel_addr] [initrd_addr] [fdt_addr if fdt]
TYPICAL CALL
-on OMAP3:
-nandecc hw
-nand read 0x82000000 0x280000 0x400000 /* Read kernel image from NAND*/
-spl export atags /* export ATAGS */
-nand erase 0x680000 0x20000 /* erase - one page */
-nand write 0x80000100 0x680000 0x20000 /* write the image - one page */
-
-call with FDT:
+on OMAP3 with FDT:
nandecc hw
nand read 0x82000000 0x280000 0x400000 /* Read kernel image from NAND*/
tftpboot 0x80000100 devkit8000.dtb /* Read fdt */
diff --git a/doc/develop/falcon.rst b/doc/develop/falcon.rst
index 244b4ccb5c2e..5689d5b93a7b 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
------------------------------
diff --git a/include/cmd_spl.h b/include/cmd_spl.h
index 51ec12edb906..45ea91e9bce6 100644
--- a/include/cmd_spl.h
+++ b/include/cmd_spl.h
@@ -8,7 +8,6 @@
#define SPL_EXPORT (0x00000001)
#define SPL_EXPORT_FDT (0x00000001)
-#define SPL_EXPORT_ATAGS (0x00000002)
-#define SPL_EXPORT_LAST SPL_EXPORT_ATAGS
+#define SPL_EXPORT_LAST SPL_EXPORT_FDT
#endif /* _NAND_SPL_H_ */
--
2.43.0
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