A recurring theme on LKML is the boot process deadlocking due to some
process blocking waiting for random numbers, while the kernel's
Cryptographic Random Number Generator (crng) is not initalized yet,
but that very blocking means no activity happens that would generate
the entropy necessary to finalize seeding the crng.
This is not a problem on boards that have a good hwrng (when the
kernel is configured to trust it), whether in the CPU or in a TPM or
elsewhere. However, that's far from all boards out there. Moreover,
there are consumers in the kernel that try to obtain random numbers
very early, before the kernel has had any chance to initialize any
hwrng or other peripherals.
Allow a board to provide a board_rng_seed() function, which is
responsible for providing a value to be put into the rng-seed property
under the /chosen node.
The board code is responsible for how to actually obtain those
bytes.
- One possibility is for the board to load a seed "file" from
somewhere (it need not be a file in a filesystem of course), and
then ensure that that the same seed file does not get used on
subsequent boots.
* One way to do that is to delete the file, or otherwise mark it as
invalid, then rely on userspace to create a new one, and living
with the possibility of not finding a seed file during some boots.
* Another is to use the scheme used by systemd-boot and create a new
seed file immediately, but in a way that the seed passed to the
kernel and the new (i.e. next) seed cannot be deduced from each
other, see the explanation at
https://lore.kernel.org/lkml/20190929090512.GB13049@gardel-login/
and the current code at
https://github.com/systemd/systemd/blob/main/src/boot/efi/random-seed.c
- The board may have an hwrng from which some bytes can be read; while
the kernel can also do that, doing it in U-Boot and providing a seed
ensures that even very early users in the kernel get good random
numbers.
- If the board has a sensor of some sort (temperature, humidity, GPS,
RTC, whatever), mixing in a reading of that doesn't hurt.
- etc. etc.
These can of course be combined.
The rng-seed property is mixed into the pool used by the linux
kernel's CRNG very early during boot. Whether it then actually
contributes towards the kernel considering the CRNG initialized
depends on whether the kernel has been configured with
CONFIG_RANDOM_TRUST_BOOTLOADER (nowadays overridable via the
random.trust_bootloader command line option). But that's for the BSP
developer to ultimately decide.
So, if the board needs to have all that logic, why not also just have
it do the actual population of /chosen/rng-seed in ft_board_setup(),
which is not that many extra lines of code?
I considered that, but decided handling this logically belongs in
fdt_chosen(). Also, apart from saving the board code from the few
lines of boilerplate, doing it in ft_board_setup() is too late for at
least some use cases. For example, I want to allow the board logic to
decide
ok, let's pass back this buffer and use that as seed, but also let's
set random.trust_bootloader=n so no entropy is credited.
This requires the rng-seed handling to happen before bootargs
handling. For example, during the very first boot, the board might not
have a proper seed file, but the board could still return (a hash of)
some CPU serial# or whatnot, so that at least no two boards ever get
the same seed - the kernel always mixes in the value passed in
rng-seed, but if it is not "trusted", the kernel would still go
through the same motions as it would if no rng-seed was passed before
considering its CRNG initialized. I.e., by returning that
unique-to-this-board value and setting random.trust_bootloader=n, the
board would be no worse off than if board_rng_seed() returned nothing
at all.
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Add a new device tree property "u-boot,version" in the chosen node to
pass the U-Boot version to the operating system.
This can be useful to implement a firmware upgrade procedure from the
operating system.
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
This has been deprecated for over 10 years and everything now uses the
plain "phandle" property in preference. There's no need to set
linux,phandle when creating phandles for nodes that do not have one.
dtc changed the default to creating just phandle in version 1.4.5
released in September 2017 with the justification that the new style had
already been supported for 7 years by that point (see dtc commit 0016f8c
("dtc: change default phandles to ePAPR style instead of both")).
Signed-off-by: John Keeping <john@metanate.com>
Drop the Kconfigs which are not used and all references to them. In
particular, this drops CONFIG_VIDEO to avoid confusion and allow us to
eventually rename CONFIG_DM_VIDEO to CONFIG_VIDEO.
Also drop the prototype for video_get_info_str() which is no-longer used.
Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Jason Liu <jason.hui.liu@nxp.com>
Listing MTD partitions directly in the flash mode has been deprecated
for a while for kernel Device Trees. Look for a node "partitions" in the
found flash nodes and use it instead of the flash node itself for the
partition list when it exists, so Device Trees following the current
best practices can be fixed up.
Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
- fdt_support: Add fdt_for_each_node_by_compatible() helper macro
(Marek)
- turris_omnia: Fixup SATA or PCIe nodes at runtime in DT blob (Pali)
- pci_mvebu: Add support for Kirkwood PCIe controllers (Pali)
- SPL: More verifications for kwbimage in SPL (Pali)
- mvebu: Remove comphy_update_map() (Pali)
- Minor misc stuff
Add macro fdt_for_each_node_by_compatible() to allow iterating over
fdt nodes by compatible string.
Convert various usages of
off = fdt_node_offset_by_compatible(fdt, start, compat);
while (off > 0) {
code();
off = fdt_node_offset_by_compatible(fdt, off, compat);
}
and similar, to
fdt_for_each_node_by_compatible(off, fdt, start, compat)
code();
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Move Turris MOX specific remove_disabled_nodes() to fdt_support with
name fdt_delete_disabled_nodes(), so that others can potentially use it.
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
Add functions
fdt_node_offset_by_pathf(),
fdt_create_phandle_by_pathf(),
fdt_set_status_by_pathf()
to get node offset, get/create node phandle and set status for node
given by path/alias formatted with sprintf.
Add functions
fdt_create_phandle_by_compatible(),
fdt_set_status_by_compatible()
to get/create node phandle and set status for first node given by
compatible.
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
This function does not necessarily create a new phandle. If a phandle
exists, no new phandle is created.
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
Since no one uses this feature and I am not aware of any parsers of this
in Linux, remove it.
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Pratyush Yadav <p.yadav@ti.com>
Cc: Tim Harvey <tharvey@gateworks.com>
Cc: Michael Walle <michael@walle.cc>
Cc: Priyanka Jain <priyanka.jain@nxp.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Commit f0921f5098 ("fdt: Sync up to the latest libfdt") introduced
fdt_generate_phandle() in libfdt, making fdt_alloc_phandle() obsolete in
fdt_support.
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: "hui.song" <hui.song_1@nxp.com>
Cc: Meenakshi Aggarwal <meenakshi.aggarwal@nxp.com>
Cc: Priyanka Jain <priyanka.jain@nxp.com>
Cc: Ioana Ciornei <ioana.ciornei@nxp.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Add kernel-doc description for fdt_fixup_memory_banks() because it is
implemented in one specific way and this information should be available
for others to decide if their SoC conforms to it.
If you don't want U-Boot to update your memory DT layout please disable
CONFIG_ARCH_FIXUP_FDT_MEMORY.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
It is a pain to have to specify the value 16 in each call. Add a new
hextoul() function and update the code to use it.
Add a proper comment to simple_strtoul() while we are here.
Signed-off-by: Simon Glass <sjg@chromium.org>
On ARM64 secure OS can run as 64bit or 32bit that's why it is necessary to
record information about architecture that other code can read it and
properly pass it to TF-A and start in 64bit or 32bit mode.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Move the fdt_valid function to fdt_support.
This changes allow to be able to test the validity of a devicetree in
other c files.
Update code syntax.
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Maxime Ripard <maxime@cerno.tech>
By declaring board-specific board_fdt_chosen_bootargs() the kernel
command line arguments can be adjusted before injecting to flat dt
chosen node.
Signed-off-by: Niko Mauno <niko.mauno@vaisala.com>
At present fdt_read_prop() can only handle 1 or 2 cells. It is
called by fdt_read_range() which may be used to read PCI address
from <ranges> for a PCI bus node where the number of PCI address
cell is 3. The <ranges> property is an array of:
{ <child address> <parent address> <size in child address space> }
When trying to read <child address> from a PCI bus node using
fdt_read_prop(), as the codes below:
/* Read <child address> */
if (child_addr) {
r = fdt_read_prop(ranges, ranges_len, cell, child_addr,
acells);
if (r)
return r;
}
it will fail, because the PCI child address is made up of 3 cells
but fdt_read_prop() cannot handle it. We advance the cell offset
by 1 so that the <child address> can be correctly read.
This adds the special handling of such case.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
OF_STDOUT_PATH was meant to hold the devicetree path to the serial
console, to be put into the linux,stdout-path property of the chosen node.
The only user of that was sunxi, and it was actually wrong for years
there: the paths hardcoded in sunxi_common.h were not matching the DTs,
evident by the leading 0's in nodenames, which have been removed years
ago.
On top of that, "linux,stdout-path" is now deprecated for a while (Linux
commit 2a9d832cc9aae from November 2014), and also all modern DTs
(including those included in U-Boot) carry a "stdout-path" property
already.
So remove the stanza from sunxi_common.h, and, since this was the last
user, also remove the associated bits from the rest of U-Boot.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Add the following functions to get a specific device's DMA ranges:
- dev_get_dma_range()
- ofnode_get_dma_range()
- of_get_dma_range()
- fdt_get_dma_range()
They are specially useful in oder to be able validate a physical address
space range into a bus's and to convert addresses from and to address
spaces.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Peter Robinson <pbrobinson@gmail.com>
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
The __of_translate_address routine translates an address from the
device tree into a CPU physical address. A note in the description of
the routine explains that the crossing of any level with
since inherited from IBM. This does not happen for Texas Instruments, or
at least for the beaglebone device tree. Without this patch, in fact,
the translation into physical addresses of the registers contained in the
am33xx-clocks.dtsi nodes would not be possible. They all have a parent
with #size-cells = <0>.
The CONFIG_OF_TRANSLATE_ZERO_SIZE_CELLS symbol makes translation
possible even in the case of crossing levels with #size-cells = <0>.
The patch acts conservatively on address translation, except for
removing a check within the of_translate_one function in the
drivers/core/of_addr.c file:
+
ranges = of_get_property(parent, rprop, &rlen);
- if (ranges == NULL && !of_empty_ranges_quirk(parent)) {
- debug("no ranges; cannot translate\n");
- return 1;
- }
if (ranges == NULL || rlen == 0) {
offset = of_read_number(addr, na);
memset(addr, 0, pna * 4);
debug("empty ranges; 1:1 translation\n");
There are two reasons:
1 The function of_empty_ranges_quirk always returns false, invalidating
the following if statement in case of null ranges. Therefore one of
the two checks is useless.
2 The implementation of the of_translate_one function found in the
common/fdt_support.c file has removed this check while keeping the one
about the 1:1 translation.
The patch adds a test and modifies a check for the correctness of an
address in the case of enabling translation also for zero size cells.
The added test checks translations of addresses generated by nodes of
a device tree similar to those you can find in the files am33xx.dtsi
and am33xx-clocks.dtsi for which the patch was created.
The patch was also tested on a beaglebone black board. The addresses
generated for the registers of the loaded drivers are those specified
by the AM335x reference manual.
Signed-off-by: Dario Binacchi <dariobin@libero.it>
Tested-by: Dario Binacchi <dariobin@libero.it>
Reviewed-by: Simon Glass <sjg@chromium.org>
The commit 9f45aeb937 ("spl: fit: implement fdt_record_loadable") which
introduced fdt_record_loadable() state there spl_fit.c is not 64bit safe.
Based on my tests on Xilinx ZynqMP zcu102 platform there shouldn't be a
problem to record these addresses in 64bit format.
The patch adds support for systems which need to load images above 4GB.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
SPL is creating fit-images DT node when loadables are recorded in selected
configuration. Entries which are created are using entry-point and
load-addr property names. But there shouldn't be a need to use non standard
properties because entry/load are standard FIT properties. But using
standard FIT properties enables option to use generic FIT functions to
descrease SPL size. Here is result for ZynqMP virt configuration:
xilinx_zynqmp_virt: spl/u-boot-spl:all -82 spl/u-boot-spl:rodata -22 spl/u-boot-spl:text -60
The patch causes change in run time fit image record.
Before:
fit-images {
uboot {
os = "u-boot";
type = "firmware";
size = <0xfd520>;
entry-point = <0x8000000>;
load-addr = <0x8000000>;
};
};
After:
fit-images {
uboot {
os = "u-boot";
type = "firmware";
size = <0xfd520>;
entry = <0x8000000>;
load = <0x8000000>;
};
};
Replacing calling fdt_getprop_u32() by fit_image_get_entry/load() also
enables support for reading entry/load properties recorded in 64bit format.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Currently, fdt_fixup_mtdparts() only checks the compatible property.
It is pointless to fix up the disabled node.
Skip the node if it has the property:
status = "disabled"
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Platform code can call fdt_fixup_mtdparts() in order to hand U-Boot's
MTD partitions over to the Linux device tree.
Currently, fdt_fixup_mtdparts() calls mtdparts_init() in its entry.
If no target MTD device is found, an error message like follows is
displayed:
Device nand0 not found!
This occurs when the same code (e.g. arch/arm/mach-uniphier/fdt-fixup.c)
is shared among several boards, but not all of them support an MTD device.
Parse the DT first, then call mtdparts_init() only when the target MTD
node is found.
Yet, you still need to call mtdparts_init() before device_find().
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This function is only called from fdt_fixup_mtdpart() in the same file.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Currently, fdt_fixup_mtdparts() only checks the compatible property.
It is pointless to fix up the disabled node.
Skip the node if it has the property:
status = "disabled"
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Platform code can call fdt_fixup_mtdparts() in order to hand U-Boot's
MTD partitions over to the Linux device tree.
Currently, fdt_fixup_mtdparts() calls mtdparts_init() in its entry.
If no target MTD device is found, an error message like follows is
displayed:
Device nand0 not found!
This occurs when the same code (e.g. arch/arm/mach-uniphier/fdt-fixup.c)
is shared among several boards, but not all of them support an MTD device.
Parse the DT first, then call mtdparts_init() only when the target MTD
node is found.
Yet, you still need to call mtdparts_init() before device_find().
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This function is only called from fdt_fixup_mtdpart() in the same file.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Move this header out of the common header. Network support is used in
quite a few places but it still does not warrant blanket inclusion.
Note that this net.h header itself has quite a lot in it. It could be
split into the driver-mode support, functions, structures, checksumming,
etc.
Signed-off-by: Simon Glass <sjg@chromium.org>
Add support for setting linux,usable-memory property in the memory
node of device tree for the kernel [1].
This property holds a base address and size, describing a
limited region in which memory may be considered available for use by
the kernel. Memory outside of this range is not available for use.
[1] https://www.kernel.org/doc/Documentation/devicetree/bindings/chosen.txt
Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
The fdt_pci_dma_ranges() cannot work on e.g. ARM, since the DT entries
endianness is not adjusted at all. Fix this.
Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Tom Rini <trini@konsulko.com>
Currently, fdt_get_base_address() returns 0 if the "reg" property is
missing. Since 0 is a valid value, it is not suitable for the error
handling. Return OF_BAD_ADDR instead.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Add the following functions to translate DMA address to CPU address:
- dev_translate_dma_address()
- ofnode_translate_dma_address()
- of_translate_dma_address()
- fdt_translate_dma_address()
These functions work the same way as xxx_translate_address(), with the
difference that the translation relies on the "dma-ranges" property
instead of the "ranges" property.
Add related test. Test report:
=> ut dm fdt_translation
Test: dm_test_fdt_translation: test-fdt.c
Test: dm_test_fdt_translation: test-fdt.c (flat tree)
Failures: 0
Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
When using fdt_fixup_mtdparts() offset and length cell sizes
are limited to 4 bytes (1 cell). However if the mtd device is
bigger then 4GiB, then #address-cells and #size-cells are
8 bytes (2 cells) [1].
This patch read #size-cells and uses either fdt32_t or
fdt64_t cell size. The default is fdt32_t.
[1] Documentation/devicetree/bindings/mtd/partition.txt
Signed-off-by: Stefan Mavrodiev <stefan@olimex.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This function merely relocates the fdt blob, so don't let it alter
it by adding reservations that didn't exist before.
Instead, if the memory used for the fdt blob has been reserved
before calling this function, ensure the relocated memory is
marked as reserved instead.
Reported-by: Keerthy <j-keerthy@ti.com>
Reported-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
Commit 6d29cc7dcf ("fdt: Fixup only valid memory banks") ended up
being merged twice, first as:
commit 6d29cc7dcf
Author: Thierry Reding <treding@nvidia.com>
AuthorDate: Tue Jan 30 11:34:17 2018 +0100
Commit: Simon Glass <sjg@chromium.org>
CommitDate: Sun Feb 18 12:53:38 2018 -0700
fdt: Fixup only valid memory banks
Memory banks with address 0 and size 0 are empty and should not be
passed to the OS via device tree.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
and later again, though this time it was v2:
commit ed5af03f9b
Author: Thierry Reding <treding@nvidia.com>
AuthorDate: Thu Feb 15 19:05:59 2018 +0100
Commit: Tom Rini <trini@konsulko.com>
CommitDate: Fri Feb 23 10:40:50 2018 -0500
fdt: Fixup only valid memory banks
Memory banks with address 0 and size 0 are empty and should not be
passed to the OS via device tree.
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
The second version was slightly different, so the main hunk of the patch
was applied twice. This isn't harmful because the code is idempotent,
but it's wasteful to run the same code twice.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
We usually deal with hexadecimal addresses and sizes in
device-tree. Its much easier if debug logs print hexadecimal
values too.
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
On the sandbox the memory addresses in the device tree refer to the virtual
address space of the sandbox. This implies that the memory reservations for
the fdt also have to be converted to this address space.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
In int-ll64.h, we always use the following typedefs:
typedef unsigned int u32;
typedef unsigned long uintptr_t;
typedef unsigned long long u64;
This does not need to match to the compiler's <inttypes.h>.
Do not include it.
The use of PRI* makes the code super-ugly. You can simply use
"l" for printing uintptr_t, "ll" for u64, and no modifier for u32.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
If CONFIG_NR_DRAM_BANKS is bigger than the default
value (4) define MEMORY_BANKS_MAX as CONFIG_NR_DRAM_BANKS.
Fixes: 2a1f4f1758 ("Revert "fdt_support: Use CONFIG_NR_DRAM_BANKS if defined"")
Signed-off-by: Ramon Fried <ramon.fried@gmail.com>
These functions are only called in this file that's why make them static
to keep static analysers happy.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
