Simon Glass [Sat, 12 Mar 2016 05:07:16 +0000 (22:07 -0700)]
x86: Add support for running Intel reference code
Intel has invented yet another binary blob which firmware is required to
run. This is run after SDRAM is ready. It is linked to load at a particular
address, typically 0, but is a relocatable ELF so can be moved if required.
Add support for this in the build system. The file should be placed in the
board directory, and called refcode.elf.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Sat, 12 Mar 2016 05:07:13 +0000 (22:07 -0700)]
x86: Add an ICH6 pin configuration driver
Add a driver which sets up the pin configuration on x86 devices with an ICH6
(or later) Platform Controller Hub.
The driver is not in the pinctrl uclass due to some oddities of the way x86
devices work:
- The GPIO controller is not present in I/O space until it is set up
- This is done by writing a register in the PCH
- The PCH has a driver which itself uses PCI, another driver
- The pinctrl uclass requires that a pinctrl device be available before any
other device can be probed
It would be possible to work around the limitations by:
- Hard-coding the GPIO address rather than reading it from the PCH
- Using special x86 PCI access to set the GPIO address in the PCH
However it is not clear that this is better, since the pin configuration
driver does not actually provide normal pin configuration services - it
simply sets up all the pins statically when probed. While this remains the
case, it seems better to use a syscon uclass instead. This can be probed
whenever it is needed, without any limitations.
Also add an 'invert' property to support inverting the input.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Sat, 12 Mar 2016 05:07:12 +0000 (22:07 -0700)]
x86: link: Add pin configuration to the device tree
At present pin configuration on link does not use the standard mechanism,
but some rather ugly custom code. As a first step to resolving this, add the
pin configuration to the device tree.
Four of the GPIOs must be available before relocation (for SDRAM pin
strapping).
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Sat, 12 Mar 2016 05:07:00 +0000 (22:07 -0700)]
x86: Move Intel Management Engine code to a common place
Some of the Intel ME code is common to several Intel CPUs. Move it into a
common location. Add a header file for report_platform.c also.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
[squashed in http://patchwork.ozlabs.org/patch/598372/] Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Sat, 12 Mar 2016 05:06:55 +0000 (22:06 -0700)]
x86: Create a common header for Intel register access
There are several blocks of registers that are accessed from all over the
code on Intel CPUs. These don't currently have their own driver and it is
not clear whether having a driver makes sense.
An example is the Memory Controller Hub (MCH). We map it to a known location
on some Intel chips (mostly those without FSP - Firmware Support Package).
Add a new header file for these registers, and move MCH into it.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Sat, 12 Mar 2016 05:06:51 +0000 (22:06 -0700)]
x86: Allow use of serial soon after relocation
At present on x86 machines with use cache-as-RAM, the memory goes away just
before board_init_r() is called. This means that serial drivers are
no-longer unavailable, until initr_dm() it called, etc.
Any attempt to use printf() within this period will cause a hang.
To fix this, mark the serial devices as 'unavailable' when it is no-longer
available. Bring it back when serial_initialize() is called. This means that
the debug UART will be used instead for this period.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Sat, 12 Mar 2016 05:06:49 +0000 (22:06 -0700)]
syscon: Avoid returning a device on failure
If the device cannot be probed, syscon_get_by_driver_data() will still
return a useful value in its devp parameter. Ensure that it returns NULL
instead.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Sat, 12 Mar 2016 05:06:46 +0000 (22:06 -0700)]
dm: timer: Correct timer init ordering after relocation
Commit 1057e6c broke use of the timer with driver model. If the timer is used
before relocation, then it becomes broken after relocation. This prevents
some x86 boards from booting. Fix it.
Fixes: 1057e6c (timer: Set up the real timer after driver model is available) Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Mon, 7 Mar 2016 02:28:25 +0000 (19:28 -0700)]
x86: Add comments to the SIPI vector
The Intel SIPI (start-up inter-processor interrupt) vector is the entry
point for each secondary CPU (also called an AP - applications processor).
The assembler and C code are linked, so add comments to indicate this.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Mon, 7 Mar 2016 02:28:22 +0000 (19:28 -0700)]
x86: Tidy up mp_init to reduce duplication
The timeout step is always 50us. By updating apic_wait_timeout() to print
the debug messages we can simplify the code. Also tidy up a few messages and
comments while we are here.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Mon, 7 Mar 2016 02:28:13 +0000 (19:28 -0700)]
x86: gpio: Correct GPIO setup ordering
The Intel GPIO driver can set up the GPIO pin mapping when the first GPIO
is probed. However, it assumes that the first GPIO to be probed is in the
first GPIO bank. If this is not the case then the init will write to the
wrong registers.
Fix this. Also add a note that this code is deprecated. We should move to
using device tree instead.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Mon, 7 Mar 2016 02:28:11 +0000 (19:28 -0700)]
x86: dts: link: Move SPD info into the memory controller
The SDRAM SPD (Serial Presence Detect) information should be contained
with the SDRAM controller. This makes it easier for the controller to access
it and removes the need for a separate compatible string.
As a first step, move the information.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Mon, 7 Mar 2016 02:28:04 +0000 (19:28 -0700)]
x86: Add some more common MSR indexes
Many of the model-specific indexes are common to several Intel CPUs. Add
some more common ones, and remove them from the ivybridge-specific header
file.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Mon, 7 Mar 2016 02:27:52 +0000 (19:27 -0700)]
pci: Add functions to update PCI configuration registers
It is common to read a config register value, clear and set some bits, then
write back the updated value. Add functions to do this in one step, for
convenience.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Mon, 7 Mar 2016 02:27:50 +0000 (19:27 -0700)]
gpio: Add a function to obtain a GPIO vector value
We can use GPIOs as binary digits for reading 'strapping' values. Each GPIO
is assigned a single bit and can be set high or low on the circuit board. We
already have a legacy function for reading these values. Add one that
supports driver model.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Mon, 7 Mar 2016 02:27:49 +0000 (19:27 -0700)]
cpu: Add support for microcode version and CPU ID
Some CPUs use microcode and each core can have a different version of
microcode loaded. Also some CPUs support the concept of an integer ID used
for identification purposes. Add support for these in the CPU uclass.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Mon, 7 Mar 2016 02:27:48 +0000 (19:27 -0700)]
video: Allow simple-panel to be used without regulators
At present simple-panel requires regulator support and will not build
without it. But some panels do not have a power supply, or at least not one
that can be controlled. Update the implementation to cope with this.
Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Anatolij Gustschin <agust@denx.de>
Bin Meng [Mon, 29 Feb 2016 07:54:50 +0000 (23:54 -0800)]
x86: Support booting SeaBIOS
SeaBIOS is an open source implementation of a 16-bit x86 BIOS.
It can run in an emulator or natively on x86 hardware with the
use of coreboot. With SeaBIOS's help, we can boot some OSes
that require 16-bit BIOS services like Windows/DOS.
As U-Boot, we have to manually create a table where SeaBIOS gets
system information (eg: E820) from. The table unfortunately has
to follow the coreboot table format as SeaBIOS currently supports
booting as a coreboot payload.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
Bin Meng [Sun, 28 Feb 2016 06:58:02 +0000 (22:58 -0800)]
x86: Support writing configuration tables in high area
For those secondary bootloaders like SeaBIOS who want to live in
the F segment, which conflicts the configuration table address,
now we allow write_tables() to write the configuration tables in
high area (malloc'ed memory).
Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
Tom Rini [Tue, 15 Mar 2016 21:56:29 +0000 (17:56 -0400)]
spl: arm: Make sure to include all of the u_boot_list entries
Starting with 96e5b03 we use a linker list for partition table
information. However since we use this in SPL we need to make sure that
the SPL linker scripts include these as well. While doing this, it's
best to simply include all linker lists to future proof ourselves.
Cc: Andreas Bießmann <andreas.devel@googlemail.com> Acked-by: Michal Simek <michal.simek@xilinx.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reported-by: Nishanth Menon <nm@ti.com> Tested-by: Nishanth Menon <nm@ti.com> Signed-off-by: Tom Rini <trini@konsulko.com>
Tom Rini [Wed, 16 Mar 2016 19:25:46 +0000 (15:25 -0400)]
mvebu: ds414: Move cmd_syno into ds414 directory
When we switch to including all linker lists in SPL it is important to
not include commands as that may lead to link errors due to other things
we have already discarded. In this case as we don't have other common
code nor other Synology borads, move the cmd_syno.c file (which claims
to be ds414 specific anyways!) into the ds414 directory and only build
it for non-SPL builds.
Tom Rini [Wed, 16 Mar 2016 14:38:21 +0000 (10:38 -0400)]
arm: omap-common: Guard some parts of the code with CONFIG_OMAP44XX/OMAP54XX
On OMAP4 platforms that also need to calculate their DDR settings we are
now getting very close to the linker limit size. Since OMAP44XX is only
seen with LPDDR2, remove some run time tests for LPDDR2 or DDR3 as we
will know that we don't have it for OMAP44XX.
Cc: Nishanth Menon <nm@ti.com> Signed-off-by: Tom Rini <trini@konsulko.com>
Tom Rini [Wed, 16 Mar 2016 13:56:55 +0000 (09:56 -0400)]
lpc32xx: work_92105: Rework Makefile
When we switch to including all linker lists in SPL it is important
to not include commands as that may lead to link errors due to other
things we have already discarded. In this case change things so that we
only build the right objects for SPL or non-SPL
Cc: Albert ARIBAUD (3ADEV) <albert.aribaud@3adev.fr> Signed-off-by: Tom Rini <trini@konsulko.com>
Tom Rini [Wed, 16 Mar 2016 13:45:03 +0000 (09:45 -0400)]
cmd: scsi: Group the command portion together, guard with !CONFIG_SPL_BUILD
When we switch to including all linker lists in SPL it is important
to not include commands as that may lead to link errors due to other
things we have already discarded. In this case, the SCSI code needs a lot
of attention so for now just guard the command portions.
Tom Rini [Wed, 16 Mar 2016 13:24:00 +0000 (09:24 -0400)]
ARM: keystone2: Only link cmd_ddr3.o on non-SPL builds
When we switch to including all linker lists in SPL it is important
to not include commands as that may lead to link errors due to other
things we have already discarded. In this case simply move cmd_ddr3.o
over to the list with the rest.
Tom Rini [Wed, 16 Mar 2016 13:10:08 +0000 (09:10 -0400)]
ARM: keystone2: Split monitor code / command code
When we switch to including all linker lists in SPL it is important
to not include commands as that may lead to link errors due to other
things we have already discarded. In this case, we split the code for
supporting the monitor out from the code for loading it.
Andrew F. Davis [Fri, 11 Mar 2016 21:04:03 +0000 (15:04 -0600)]
ti_armv7_common: env: Add NFS loading support to default enviroment
NFS loading is similar to net loading except initial files are loaded
over NFS instead of TFTP, this removes the need for multiple different
protocol servers running on the host and allows the use of a single
network file system containing boot related files in their usual
in-filesystem directory. Add defaults for this boot style here.
Signed-off-by: Andrew F. Davis <afd@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com>
Nishanth Menon [Wed, 9 Mar 2016 12:09:56 +0000 (17:39 +0530)]
ARM: DRA7: DDR: Enable SR in Power Management Control
If EMIF is idle for certain amount of DDR cycles, EMIF will put the
DDR in self refresh mode to save power if EMIF_PWR_MGMT_CTRL register
is programmed. And also before entering suspend-resume ddr needs to
be put in self-refresh. Linux kernel does not program this register
before entering suspend and relies on u-boot setting.
So configuring it in u-boot.
Signed-off-by: Nishanth Menon <nm@ti.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Tested-by: Tom Rini <trini@konsulko.com> Reviewed-by: Tom Rini <trini@konsulko.com>
Yan Liu [Wed, 9 Mar 2016 10:09:39 +0000 (15:39 +0530)]
keystone2: env: Set mmc as default boot for k2g-evm
For k2l, k2e and k2hk, ubi is set to default boot in uboot
environment settings; while for k2g, mmc should be the
default boot. This patch is to set mmc as default for k2g-evm
Signed-off-by: Yan Liu <yan-liu@ti.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com>
keystone2: env: add env script for booting with an initramfs with firmware
This patch updates the env script to include a initramfs with firmware
loaded and provided to kernel through second argument of bootz command
during boot. Defined DEFAULT_FW_INITRAMFS_BOOT_ENV to have all of the
required env variables and use it in evm specific config file.
The K2 linux drivers for PCIe and NetCP (1G, 10G) requires serdes
firmwares. These requires firmware to be available early through the boot
process in some cases to satisfy firmware requests from driver. Hence use
a small initramfs to provide the same and update boot env to accommodate
this in the boot flow. This method is used when rootfs is nfs and ubifs.
This fs contains just lib/firmware folder with all required firmware.
When rootfs is on initramfs, then the filesystem has the firmware under
lib/firmware and this early initramfs is not required and is not used.
Lokesh Vutla [Wed, 9 Mar 2016 10:09:36 +0000 (15:39 +0530)]
k2g: env: Allow use of a script and plain text env files
For development purposes, it is easier to use the env import command
and plain text or script files instead of script-images. So allow
u-boot to load env var from a text file or a script file.
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com>
Lokesh Vutla [Wed, 9 Mar 2016 10:09:35 +0000 (15:39 +0530)]
ti_armv7_common: env: Consolidate support for loading script and text env files
Support for loading bootscript and text env file is duplicated in all TI
platforms. Add this information to DEFAULT_MMC_TI_ARGS so that it can be
reused in all TI platforms.
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com>
Mugunthan V N [Wed, 9 Mar 2016 10:09:34 +0000 (15:39 +0530)]
am43xx: configs: Enable USB commands for non usb boot also
With commit aee119bd70b8 ('am43xx_evm: add usb host boot support') usb
commands is removed from U-boot second stage and enbaled only on USB
boot config. Fixing this by enable USB commands for both USB boot and
in second stage u-boot.
Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com>
Lokesh Vutla [Wed, 9 Mar 2016 10:09:33 +0000 (15:39 +0530)]
am335x: configs: Fix usb ether boot support
CONFIG_SPL_NET_VCI_STRING is available only with BOOTP. So if
CMD_DHCP is enabled for SPL in usb ether boot, it will not pass
the right vendor name and failing to download the right file.
Also all the net CMD_* are not required in SPL builds. So defining
these only for non-SPL builds.
Reported-by: Yan Liu <yan-liu@ti.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Reviewed-by: Sekhar Nori <nsekhar@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com>
UBI images created by OE does not contain boot partition by default,
instead kernel and dtb are placed in /boot directory inside rootfs
partition. So update env commands to load files from correct
location.
Signed-off-by: Carlos Hernandez <ceh@ti.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com>
Alexander Graf [Fri, 4 Mar 2016 00:10:14 +0000 (01:10 +0100)]
efi_loader: Pass proper device path in on boot
EFI payloads can query for the device they were booted from. Because
we have a disconnect between loading binaries and running binaries,
we passed in a dummy device path so far.
Unfortunately that breaks grub2's logic to find its configuration
file from the same device it was booted from.
This patch adds logic to have the "load" command call into our efi
code to set the device path to the one we last loaded a binary from.
With this grub2 properly detects where we got booted from and can
find its configuration file, even when searching by-partition.
Alexander Graf [Fri, 4 Mar 2016 00:10:13 +0000 (01:10 +0100)]
efi_loader: Call fdt preparation functions
We have a nice framework around image fils to prepare a device tree
for OS execution. That one patches in missing device tree nodes and
fixes up the memory range bits.
We need to call that one from the EFI boot path too to get all those
nice fixups. This patch adds the call.
Alexander Graf [Fri, 4 Mar 2016 00:10:12 +0000 (01:10 +0100)]
arm: Allow EFI payload code to take exceptions
There are 2 ways an EFI payload could return into u-boot:
- Callback function
- Exception
While in EFI payload mode, r9 is owned by the payload and may not contain
a valid pointer to gd, so we need to fix it up. We do that properly for the
payload to callback path already.
This patch also adds gd pointer restoral for the exception path.
Alexander Graf [Fri, 4 Mar 2016 00:10:11 +0000 (01:10 +0100)]
arm64: Replace fdt_name env variables with fdtfile
The commonly defined environment variable to determine the device tree
file name is called fdtfile rather than fdt_name. Replace all occurences
of fdt_name with fdtfile.
Alexander Graf [Wed, 9 Mar 2016 23:26:15 +0000 (00:26 +0100)]
efi_loader: Add distro boot script for removable media
UEFI defines a simple boot protocol for removable media. There we should look
at the EFI (first GPT FAT) partition and search for /efi/boot/bootXXX.efi with
XXX being different between different platforms (x86, x64, arm, aa64, ...).
This patch implements a simple version of that protocol for the default distro
boot script. With this we can automatically boot from valid UEFI enabled
removable media.
Because from all I could see U-Boot by default doesn't deliver device tree
blobs with its firmware, we also need to load the dtb from somewhere. Traverse
the same EFI partition for an fdt file that fits our current board so that
an OS receives a valid device tree when booted automatically.
Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org>
Alexander Graf [Fri, 4 Mar 2016 00:10:07 +0000 (01:10 +0100)]
efi_loader: hook up in build environment
Now that we have all the bits and pieces ready for EFI payload loading
support, hook them up in Makefiles and KConfigs so that we can build.
Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org>
[trini: Enable only when we of OF_LIBFDT, disable on kwb and colibri_pxa270] Signed-off-by: Tom Rini <trini@konsulko.com>
Alexander Graf [Fri, 4 Mar 2016 00:10:06 +0000 (01:10 +0100)]
arm64: Allow EFI payload code to take exceptions
There are 2 ways an EFI payload could return into u-boot:
- Callback function
- Exception
While in EFI payload mode, x18 is owned by the payload and may not contain
a valid pointer to gd, so we need to fix it up. We do that properly for the
payload to callback path already.
This patch also adds gd pointer restoral for the exception path.
Alexander Graf [Fri, 4 Mar 2016 00:10:05 +0000 (01:10 +0100)]
arm64: Allow exceptions to return
Our current arm64 exception handlers all panic and never return to the
exception triggering code.
But if any handler wanted to continue execution after fixups, it would
need help from the exception handling code to restore all registers.
This patch implements that help. With this code, exception handlers on
aarch64 can successfully return to the place the exception happened (or
somewhere else if they modify elr).
Alexander Graf [Fri, 4 Mar 2016 00:10:04 +0000 (01:10 +0100)]
efi_loader: Implement memory allocation and map
The EFI loader needs to maintain views of memory - general system memory
windows as well as used locations inside those and potential runtime service
MMIO windows.
To manage all of these, add a few helpers that maintain an internal
representation of the map the similar to how the EFI API later on reports
it to the application.
For allocations, the scheme is very simple. We basically allow allocations
to replace chunks of previously done maps, so that a new LOADER_DATA
allocation for example can remove a piece of the RAM map. When no specific
address is given, we just take the highest possible address in the lowest
RAM map that fits the allocation size.
Signed-off-by: Alexander Graf <agraf@suse.de> Tested-by: Simon Glass <sjg@chromium.org>
Alexander Graf [Wed, 9 Mar 2016 23:27:20 +0000 (00:27 +0100)]
efi_loader: Add "bootefi" command
In order to execute an EFI application, we need to bridge the gap between
U-Boot's notion of executing images and EFI's notion of doing the same.
The best path forward IMHO here is to stick completely to the way U-Boot
deals with payloads. You manually load them using whatever method to RAM
and then have a simple boot command to execute them. So in our case, you
would do
which then gets you into a grub shell. Fdt information known to U-boot
via the fdt addr command is also passed to the EFI payload.
Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org>
[trini: Guard help text with CONFIG_SYS_LONGHELP] Signed-off-by: Tom Rini <trini@konsulko.com>
Alexander Graf [Fri, 4 Mar 2016 00:10:02 +0000 (01:10 +0100)]
efi_loader: Add disk interfaces
A EFI applications usually want to access storage devices to load data from.
This patch adds support for EFI disk interfaces. It loops through all block
storage interfaces known to U-Boot and creates an EFI object for each existing
one. EFI applications can then through these objects call U-Boot's read and
write functions.
Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org>
[trini: Update for various DM changes since posting] Signed-off-by: Tom Rini <trini@konsulko.com>
Alexander Graf [Fri, 4 Mar 2016 00:10:01 +0000 (01:10 +0100)]
efi_loader: Add runtime services
After booting has finished, EFI allows firmware to still interact with the OS
using the "runtime services". These callbacks live in a separate address space,
since they are available long after U-Boot has been overwritten by the OS.
This patch adds enough framework for arbitrary code inside of U-Boot to become
a runtime service with the right section attributes set. For now, we don't make
use of it yet though.
We could maybe in the future map U-boot environment variables to EFI variables
here.
Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org>
Alexander Graf [Fri, 4 Mar 2016 00:10:00 +0000 (01:10 +0100)]
efi_loader: Add console interface
One of the basic EFI interfaces is the console interface. Using it an EFI
application can interface with the user. This patch implements an EFI console
interface using getc() and putc().
Today, we only implement text based consoles. We also convert the EFI Unicode
characters to UTF-8 on the fly, hoping that everyone managed to jump on the
train by now.
Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org>