Mirrors/u-boot
2
0
Fork 0
mirror of https://github.com/AsahiLinux/u-boot synced 2024-11-10 15:14:43 +00:00
Code Issues Projects Releases Packages Wiki Activity

spl: dm: Make it possible for the SPL to pick its own DTB from a FIT

Browse source 
u-boot can be embedded within a FIT image with multiple DTBs. It then
selects at run-time  which one is best suited for the platform.
Use the same principle here for the SPL: put the DTBs in a FIT image,
compress it (LZO, GZIP, or no compression) and append it at the end of the
SPL.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
[trini: Move default y of SPL_MULTI_DTB_FIT_DYN_ALLOC to it being the
default choice if SYS_MALLOC_F, drop spl.h include from lib/fdtdec.c
it's unused.]
Signed-off-by Tom Rini <trini@konsulko.com>
This commit is contained in:
Jean-Jacques Hiblot 2017-09-15 12:57:32 +02:00 committed by Tom Rini
parent 035d64025c
commit 2f57c95100
4 changed files with 248 additions and 13 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

56
doc/README.multi-dtb-fit
View file

@ -1,8 +1,11 @@
MULTI DTB FIT
MULTI DTB FIT and SPL_MULTI_DTB_FIT
The purpose of this feature is to enable u-boot to select its DTB from a FIT
appended at the end of the binary.
The purpose of this feature is to enable U-Boot or the SPL to select its DTB
from a FIT appended at the end of the binary.
It comes in two flavors: U-Boot (CONFIG_MULTI_DTB_FIT) and SPL
(CONFIG_SPL_MULTI_DTB_FIT).
U-Boot flavor:
Usually the DTB is selected by the SPL and passed down to U-Boot. But some
platforms don't use the SPL. In this case MULTI_DTB_FIT can used to provide
U-Boot with a choice of DTBs.
@ -13,3 +16,50 @@ the FIT.
The selection is done using board_fit_config_name_match() (same as what the SPL
uses to select the DTB for U-Boot). The selection happens during fdtdec_setup()
which is called during before relocation by board_init_f().
SPL flavor:
the SPL uses only a small subset of the DTB and it usually depends more
on the SOC than on the board. So it's usually fine to include a DTB in the
SPL that doesn't exactly match the board. There are howerver some cases
where it's not possible. In the later case, in order to support multiple
boards (or board revisions) with the same SPL binary, SPL_MULTI_DTB_FIT
can be used.
The relevant DTBs are packed into a FIT. This FIT is automatically generated
at the end of the compilation, compressed and appended to u-boot-spl.bin, so
that SPL can locate it and select the correct DTB from inside the FIT.
CONFIG_SPL__OF_LIST is used to list the relevant DTBs.
The compression stage is optional but reduces the impact on the size of the
SPL. LZO and GZIP compressions are supported. By default, the area where the
FIT is uncompressed is dynamicaly allocated but this behaviour can be changed
for platforms that don't provide a HEAP big enough to contain the uncompressed
FIT.
The SPL uses board_fit_config_name_match() to find the correct DTB within the
FIT (same as what the SPL uses to select the DTB for U-Boot).
Uncompression and selection stages happen in fdtdec_setup() which is called
during the early initialization stage of the SPL (spl_early_init() or
spl_init())
Impacts and performances (SPL flavor):
The impact of this option is relatively small. Here are some numbers measured
for a TI DRA72 platform:
+----------+------------+-----------+------------+
| size | size delta | SPL boot | boot time |
| (bytes) | (bytes) | time (s) | delta (s) |
+---------------------------+----------+------------+-----------+------------+
| 1 DTB | | | | |
+---------------------------+----------+------------+-----------+------------+
| reference | 125305 | 0 | 1.389 | 0 |
| LZO (dynamic allocation) | 125391 | 86 | 1.381 | -0.008 |
+---------------------------+----------+------------+-----------+------------+
| 4 DTBs (DRA7, DRA71, | | | | |
| DRA72, DRA72 revC) | | | | |
+---------------------------+----------+------------+-----------+------------+
| LZO (dynamic allocation) | 125991 | 686 | 1.39 | 0.001 |
| LZO (user defined area) | 125927 | 622 | 1.403 | 0.014 |
| GZIP (user defined area) | 133880 | 8575 | 1.421 | 0.032 |
| No compression (in place) | 137472 | 12167 | 1.412 | 0.023 |
+---------------------------+----------+------------+-----------+------------+
Note: SPL boot time is the time elapsed between the 'reset' command is entered
and the time when the first U-Boot (not SPL) version string is displayed.

83
dts/Kconfig
View file

@ -130,6 +130,89 @@ config MULTI_DTB_FIT
the correct DTB to be used. Use this if you need to support
multiple DTBs but don't use the SPL.
config SPL_MULTI_DTB_FIT
depends on SPL_LOAD_FIT && SPL_OF_CONTROL && !SPL_OF_PLATDATA
bool "Support embedding several DTBs in a FIT image for the SPL"
help
This option provides the SPL with the ability to select its own
DTB at runtime from an appended FIT image containing several DTBs.
This allows using the same SPL binary on multiple platforms.
The primary purpose is to handle different versions of
the same platform without tweaking the platform code if the
differences can be expressed in the DTBs (common examples are: bus
capabilities, pad configurations).
config SPL_OF_LIST
string "List of device tree files to include for DT control in SPL"
depends on SPL_MULTI_DTB_FIT
default OF_LIST
help
This option specifies a list of device tree files to use for DT
control in the SPL. These will be packaged into a FIT. At run-time,
the SPL will select the correct DT to use by examining the
hardware (e.g. reading a board ID value). This is a list of
device tree files (without the directory or .dtb suffix)
separated by <space>.
choice
prompt "SPL OF LIST compression"
depends on SPL_MULTI_DTB_FIT
default SPL_MULTI_DTB_FIT_LZO
config SPL_MULTI_DTB_FIT_LZO
bool "LZO"
depends on SYS_MALLOC_F
select SPL_LZO
help
Compress the FIT image containing the DTBs available for the SPL
using LZO compression. (requires lzop on host).
config SPL_MULTI_DTB_FIT_GZIP
bool "GZIP"
depends on SYS_MALLOC_F
select SPL_GZIP
help
Compress the FIT image containing the DTBs available for the SPL
using GZIP compression. (requires gzip on host)
config SPL_MULTI_DTB_FIT_NO_COMPRESSION
bool "No compression"
help
Do not compress the FIT image containing the DTBs available for the SPL.
Use this options only if LZO is not available and the DTBs are very small.
endchoice
choice
prompt "Location of uncompressed DTBs "
depends on (SPL_MULTI_DTB_FIT_GZIP || SPL_MULTI_DTB_FIT_LZO)
default SPL_MULTI_DTB_FIT_DYN_ALLOC if SYS_MALLOC_F
config SPL_MULTI_DTB_FIT_DYN_ALLOC
bool "Dynamically allocate the memory"
depends on SYS_MALLOC_F
config SPL_MULTI_DTB_FIT_USER_DEFINED_AREA
bool "User-defined location"
endchoice
config SPL_MULTI_DTB_FIT_UNCOMPRESS_SZ
hex "Size of memory reserved to uncompress the DTBs"
depends on (SPL_MULTI_DTB_FIT_GZIP || SPL_MULTI_DTB_FIT_LZO)
default 0x8000
help
This is the size of this area where the DTBs are uncompressed.
If this area is dynamically allocated, make sure that
SPL_SYS_MALLOC_F_LEN is big enough to contain it.
config SPL_MULTI_DTB_FIT_USER_DEF_ADDR
hex "Address of memory where dtbs are uncompressed"
depends on SPL_MULTI_DTB_FIT_USER_DEFINED_AREA
help
the FIT image containing the DTBs is uncompressed in an area defined
at compilation time. This is the address of this area. It must be
aligned on 2-byte boundary.
config OF_SPL_REMOVE_PROPS
string "List of device tree properties to drop for SPL"
depends on SPL_OF_CONTROL

87
lib/fdtdec.c
View file

@ -15,6 +15,7 @@
#include <serial.h>
#include <asm/sections.h>
#include <linux/ctype.h>
#include <linux/lzo.h>
DECLARE_GLOBAL_DATA_PTR;
@ -1203,9 +1204,66 @@ int fdtdec_setup_memory_banksize(void)
}
#endif
#if CONFIG_IS_ENABLED(MULTI_DTB_FIT)
# if CONFIG_IS_ENABLED(MULTI_DTB_FIT_GZIP) ||\
CONFIG_IS_ENABLED(MULTI_DTB_FIT_LZO)
static int uncompress_blob(const void *src, ulong sz_src, void **dstp)
{
size_t sz_out = CONFIG_SPL_MULTI_DTB_FIT_UNCOMPRESS_SZ;
ulong sz_in = sz_src;
void *dst;
int rc;
if (CONFIG_IS_ENABLED(GZIP))
if (gzip_parse_header(src, sz_in) < 0)
return -1;
if (CONFIG_IS_ENABLED(LZO))
if (!lzop_is_valid_header(src))
return -EBADMSG;
if (CONFIG_IS_ENABLED(MULTI_DTB_FIT_DYN_ALLOC)) {
dst = malloc(sz_out);
if (!dst) {
puts("uncompress_blob: Unable to allocate memory\n");
return -ENOMEM;
}
} else {
# if CONFIG_IS_ENABLED(MULTI_DTB_FIT_USER_DEFINED_AREA)
dst = (void *)CONFIG_VAL(MULTI_DTB_FIT_USER_DEF_ADDR);
# else
return -ENOTSUPP;
# endif
}
if (CONFIG_IS_ENABLED(GZIP))
rc = gunzip(dst, sz_out, (u8 *)src, &sz_in);
else if (CONFIG_IS_ENABLED(LZO))
rc = lzop_decompress(src, sz_in, dst, &sz_out);
if (rc < 0) {
/* not a valid compressed blob */
puts("uncompress_blob: Unable to uncompress\n");
if (CONFIG_IS_ENABLED(MULTI_DTB_FIT_DYN_ALLOC))
free(dst);
return -EBADMSG;
}
*dstp = dst;
return 0;
}
# else
static int uncompress_blob(const void *src, ulong sz_src, void **dstp)
{
return -ENOTSUPP;
}
# endif
#endif
int fdtdec_setup(void)
{
#if CONFIG_IS_ENABLED(OF_CONTROL)
# if CONFIG_IS_ENABLED(MULTI_DTB_FIT)
void *fdt_blob;
# endif
# ifdef CONFIG_OF_EMBED
/* Get a pointer to the FDT */
gd->fdt_blob = __dtb_dt_begin;
@ -1216,15 +1274,6 @@ int fdtdec_setup(void)
gd->fdt_blob = (ulong *)&_image_binary_end;
else
gd->fdt_blob = (ulong *)&__bss_end;
# elif defined CONFIG_MULTI_DTB_FIT
gd->fdt_blob = locate_dtb_in_fit(&_end);
if (gd->fdt_blob == NULL || gd->fdt_blob <= ((void *)&_end)) {
puts("Failed to find proper dtb in embedded FIT Image\n");
return -1;
}
# else
/* FDT is at end of image */
gd->fdt_blob = (ulong *)&_end;
@ -1243,7 +1292,27 @@ int fdtdec_setup(void)
gd->fdt_blob = (void *)env_get_ulong("fdtcontroladdr", 16,
(uintptr_t)gd->fdt_blob);
# endif
# if CONFIG_IS_ENABLED(MULTI_DTB_FIT)
/*
* Try and uncompress the blob.
* Unfortunately there is no way to know how big the input blob really
* is. So let us set the maximum input size arbitrarily high. 16MB
* ought to be more than enough for packed DTBs.
*/
if (uncompress_blob(gd->fdt_blob, 0x1000000, &fdt_blob) == 0)
gd->fdt_blob = fdt_blob;
/*
* Check if blob is a FIT images containings DTBs.
* If so, pick the most relevant
*/
fdt_blob = locate_dtb_in_fit(gd->fdt_blob);
if (fdt_blob)
gd->fdt_blob = fdt_blob;
# endif
#endif
return fdtdec_prepare_fdt();
}

35
scripts/Makefile.spl
View file

@ -209,10 +209,21 @@ cmd_cat = cat $(filter-out $(PHONY), $^) > $@
quiet_cmd_copy = COPY $@
cmd_copy = cp $< $@
ifneq ($(CONFIG_SPL_MULTI_DTB_FIT),y)
FINAL_DTB_CONTAINER = $(obj)/$(SPL_BIN).dtb
else ifeq ($(CONFIG_SPL_MULTI_DTB_FIT_LZO),y)
FINAL_DTB_CONTAINER = $(obj)/$(SPL_BIN).multidtb.fit.lzo
else ifeq ($(CONFIG_SPL_MULTI_DTB_FIT_GZIP),y)
FINAL_DTB_CONTAINER = $(obj)/$(SPL_BIN).multidtb.fit.gz
else
FINAL_DTB_CONTAINER = $(obj)/$(SPL_BIN).multidtb.fit
endif
ifeq ($(CONFIG_$(SPL_TPL_)OF_CONTROL)$(CONFIG_OF_SEPARATE)$(CONFIG_$(SPL_TPL_)OF_PLATDATA),yy)
$(obj)/$(SPL_BIN)-dtb.bin: $(obj)/$(SPL_BIN)-nodtb.bin \
$(if $(CONFIG_SPL_SEPARATE_BSS),,$(obj)/$(SPL_BIN)-pad.bin) \
$(obj)/$(SPL_BIN).dtb FORCE
$(FINAL_DTB_CONTAINER) FORCE
$(call if_changed,cat)
$(obj)/$(SPL_BIN).bin: $(obj)/$(SPL_BIN)-dtb.bin FORCE
@ -383,6 +394,28 @@ checkdtoc: tools
PHONY += FORCE
FORCE:
PHONY += dtbs
dtbs:
$(Q)$(MAKE) $(build)=dts dtbs
# Declare the contents of the .PHONY variable as phony. We keep that
# information in a variable so we can use it in if_changed and friends.
.PHONY: $(PHONY)
SHRUNK_ARCH_DTB = $(patsubst %,$(obj)/dts/%.dtb,$(subst ",,$(CONFIG_SPL_OF_LIST)))
.SECONDEXPANSION:
$(SHRUNK_ARCH_DTB): $$(patsubst $(obj)/dts/%, arch/$(ARCH)/dts/%, $$@)
$(call if_changed,fdtgrep)
MKIMAGEFLAGS_$(SPL_BIN).multidtb.fit = -f auto -A $(ARCH) -T firmware -C none -O u-boot \
-n "Multi DTB fit image for $(SPL_BIN)" -E \
$(patsubst %,-b %,$(SHRUNK_ARCH_DTB))
$(obj)/$(SPL_BIN).multidtb.fit: /dev/null $(SHRUNK_ARCH_DTB) FORCE
$(call if_changed,mkimage)
$(obj)/$(SPL_BIN).multidtb.fit.gz: $(obj)/$(SPL_BIN).multidtb.fit
@gzip -kf9 $< > $@
$(obj)/$(SPL_BIN).multidtb.fit.lzo: $(obj)/$(SPL_BIN).multidtb.fit
@lzop -f9 $< > $@