Commit graph

55749 commits

Author SHA1 Message Date
Yunfeng Ding
d2c49aad51 board: Enable DHCP distro boot for LS1012a, LS1021a
Enable DHCP distro boot for Layerscape LS1012A and LS1021A.

Signed-off-by: Yunfeng Ding <yunfeng.ding@nxp.com>
Signed-off-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-03 22:01:19 +05:30
Laurentiu Tudor
7122f79141 armv8: fsl-layerscape: avoid DT fixup warning
sec_firmware reserves JR3 for it's own usage and deletes the JR3 node
from the device tree. This causes this warning to be issued when doing
the device tree fixup:

WARNING could not find node fsl,sec-v4.0-job-ring: FDT_ERR_NOTFOUND.

Fix it by excluding the device tree fixup for the JR reserved by
sec_firmware.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Reviewed-by: Horia Geanta <horia.geanta@nxp.com>
Reviewed-by: Bharat Bhushan <bharat.bhushan@nxp.com>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-03 22:01:14 +05:30
Laurentiu Tudor
e82d9ee73a armv8: fsl-layerscape: fix SEC QI ICID setup
The SEC QI ICID setup in the QIIC_LS register is actually an offset
that is being added to the ICID coming from the qman portal. Setting
it with a non-zero value breaks SMMU setup as the resulting ICID is
not known. On top of that, the SEC QI ICID must match the qman portal
ICIDs in order to share the isolation context.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Reviewed-by: Horia Geanta <horia.geanta@nxp.com>
Reviewed-by: Bharat Bhushan <bharat.bhushan@nxp.com>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-03 22:01:09 +05:30
Laurentiu Tudor
d8d5fdb7b2 fsl_sec: fix register layout on Layerscape architectures
On Layerscape architectures the SEC memory map is 1MB and the
register blocks contained in it are 64KB aligned, not 4KB as
the ccsr_sec structure currently assumes. Fix the layout of
the structure for these architectures.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Reviewed-by: Horia Geanta <horia.geanta@nxp.com>
Reviewed-by: Bharat Bhushan <bharat.bhushan@nxp.com>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-03 22:01:04 +05:30
Prabhakar Kushwaha
910e8fdaac board: ls1046qds: Enable PPA for secure boot
Re-organize defconfig and enabled PPA for secure boot

Signed-off-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-03 21:59:42 +05:30
Rajesh Bhagat
32413125b3 configs: fsl: move DDR specific defines to Kconfig
Moves below DDR specific defines to Kconfig:

CONFIG_FSL_DDR_BIST
CONFIG_FSL_DDR_FIRST_SLOT_QUAD_CAPABLE
CONFIG_FSL_DDR_INTERACTIVE
CONFIG_FSL_DDR_SYNC_REFRESH

Signed-off-by: Rajesh Bhagat <rajesh.bhagat@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-03 20:56:01 +05:30
Mian Yousaf Kaukab
31a1c951ef board: ls1043a: use default scan_dev_for_boot
Default environment variable is more complete. Also scans for efi
binaries for example.

Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Reviewed-by: Ashish Kumar <Ashish.Kumar@nxp.com>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-03 20:56:00 +05:30
Mian Yousaf Kaukab
688cdf4cad board: ls1043a: enable dhcp boot
dhcp boot is a useful feature and works out-of-the-box on these
platforms. Enable it as a boot source.

Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-03 20:56:00 +05:30
Mian Yousaf Kaukab
c504b0d62c board: ls1043a: enable EFI_LOADER_BOUNCE_BUFFER
EFI applications need bounce buffers to work properly on these
platforms.

Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-03 20:56:00 +05:30
Mian Yousaf Kaukab
d3d86fca22 board: ls1046a: use default scan_dev_for_boot
Default environment variable is more complete. Also scans for efi
binaries for example.

Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-03 20:56:00 +05:30
Mian Yousaf Kaukab
f43cc40289 board: ls1046a: enable dhcp boot
dhcp boot is a useful feature and works out-of-the-box on these
platforms. Enable it as a boot source.

Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-03 20:56:00 +05:30
Mian Yousaf Kaukab
1eb41fca08 board: ls1046a: enable EFI_LOADER_BOUNCE_BUFFER
EFI applications need bounce buffers to work properly on these
platforms.

Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-03 20:56:00 +05:30
Mian Yousaf Kaukab
1a1e272a17 board: ls2080ardb: use default scan_dev_for_boot
Default environment variable is more complete. Also scans for efi
binaries for example.

Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-03 20:56:00 +05:30
Mian Yousaf Kaukab
e0db2f42f8 Revert "ls2080ardb: remove dhcp function from env as boot source"
dhcp boot is a useful feature and works out-of-the-box for ls2088a
platforms. Moreover, no solid reason is given for disabling it.
Revert the patch to re-enable it.

This reverts commit aea5cd75e6.

Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-03 20:56:00 +05:30
Mian Yousaf Kaukab
e068928153 board: ls1088ardb: use default scan_dev_for_boot
Default environment variable is more complete. Also scans for efi
binaries for example.

Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-03 20:56:00 +05:30
Mian Yousaf Kaukab
080c951a29 Revert "ls1088a: remove dhcp function from u-boot env as boot source"
dhcp boot is a useful feature and works out-of-the-box for ls1088a
platforms. Moreover, no solid reason is given for disabling it.
Revert the patch to re-enable it.

This reverts commit 863e42e8b1.

Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-03 20:56:00 +05:30
Mian Yousaf Kaukab
730bd5658b board: ls1088a: fix fsl-mc search path
Path for fsl-mc node in kernel device-tree is /soc/fsl-mc whereas
in u-boot it is /fsl-mc.

Fix the incorrect search path to fix following error:
fdt_fixup_board_enet: ERROR: fsl-mc node not found in device tree
(error -1)

Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-03 20:56:00 +05:30
Mian Yousaf Kaukab
4130780a83 board: ls1088a: fix dppa exit when using efi boot
Same issue for ls2080a was fixed by following patch:
b7b8410a8f ls2080: Exit dpaa only right before exiting U-Boot

Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Reviewed-by: Ashish Kumar <Ashish.Kumar@nxp.com>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-03 20:56:00 +05:30
Tom Rini
4a9c78a062 Merge git://git.denx.de/u-boot-mpc85xx 2019-03-03 08:00:30 -05:00
Heinrich Schuchardt
1a9fce5039 efi_loader: HII protocols: debug messages
When package types are not supported by our implementation of the HII
database protocol supported error messages are displayed.

Essentially the output is only needed for debugging. By using EFI_PRINT()
the messages are only written for in debug mode and with correct
indentation.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-03-02 23:34:26 +01:00
Heinrich Schuchardt
1fa442ed43 efi_loader: error handling for efidebug boot add
In  `efidebug boot add iPXE scsi 0:1 snp-arm64.efi --foo` a parameter is
missing. Hence the command should not silently return as if everything were
ok but should display the usage info.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Alexander Graf <agraf@csgraf.de>
2019-03-02 23:34:26 +01:00
Heinrich Schuchardt
fdef298338 efi_loader: HII protocols: fix new_package_list()
In new_package_list() we call new_packagelist() to create a new package
list. Next we try to add the packages which fails for form packages. Due
to this error we call free_packagelist(). Now in free_packagelist()
list_del() is called for an uninitialized field hii->link. This leads to
changing random memory addresses.

To solve the problem move the initialization of hii->link to
new_packagelist().

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
2019-03-02 23:34:26 +01:00
Heinrich Schuchardt
30a231dcce efi_loader: do not add \ in efi_fs_from_name()
In the `efidebug boot add` command we do not want an unsolicited leading
backslash added to the file name.

There is no good reason to mark a loaded file with a backslash as absolute.
Anyway when reading files the file name will be interpreted as relative to
root directory of the device.

So let's get rid of this backslash.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-03-02 23:34:26 +01:00
Peng Ma
9390ff732d powerpc: t104xrdb: Add support of MTA9ADF1G72AZ DDR
T1040RDB has been upgraded to support  new DDR ie. MTA9ADF1G72AZ-3G2, 8GB.
So adding support of new DDR part by updating board_specific_parameters
udimm0.

Signed-off-by: Peng Ma <peng.ma@nxp.com>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-02 18:11:20 +05:30
Heinrich Schuchardt
70eb82539b powerpc: enabled building with CONFIG_DM=y
Moving to the driver model requires CONFIG_DM to be enabled. Currently
several boards like kmeter1_defconfig produce a build error when CONFIG_DM
is enabled:

In file included from include/common.h:35,
                 from ./arch/powerpc/include/asm/fsl_lbc.h:10,
                 from include/mpc83xx.h:10,
                 from ./arch/powerpc/include/asm/ppc.h:27,
                 from ./arch/powerpc/include/asm/u-boot.h:18,
                 from include/dm/of.h:10,
                 from include/dm/ofnode.h:12,
                 from include/dm/device.h:13,
                 from include/linux/mtd/mtd.h:26,
                 from drivers/mtd/mtdconcat.c:25:
include/image.h: In function ‘image_check_target_arch’:
include/image.h:846:3: error: #error "please define IH_ARCH_DEFAULT in
                       your arch asm/u-boot.h"
 # error "please define IH_ARCH_DEFAULT in your arch asm/u-boot.h"
   ^~~~~
include/image.h:848:31: error: ‘IH_ARCH_DEFAULT’ undeclared (first use in
                        this function); did you mean ‘IH_ARCH_COUNT’?
  return image_check_arch(hdr, IH_ARCH_DEFAULT);

The error can be avoided by moving the definition of IH_ARCH_DEFAULT before

     #include <asm/ppc.h>

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
2019-03-02 18:11:20 +05:30
Tom Rini
cfba74d0be Merge branch 'master' of git://git.denx.de/u-boot-socfpga
- SoCFPGA cache/gpio fixes
2019-02-28 18:57:32 -05:00
Tom Rini
35b05146f6 Merge branch 'master' of git://git.denx.de/u-boot-sh
- Gen2/Gen3 fixes for warnings and sdhi
2019-02-28 18:57:17 -05:00
Tom Rini
da206916a1 Merge branch 'master' of git://git.denx.de/u-boot-sunxi
- Various Bananapi fixes
2019-02-28 14:22:50 -05:00
Tom Rini
7869e647a6 Merge branch '2019-02-29-master-imports'
- Assorted BSP fixes
- Kbuild fix
2019-02-28 14:22:03 -05:00
Simon Goldschmidt
438dcabb75 spl: add debug print for early malloc usage
To find out how big the early malloc heap must be in SPL, add a debug
print statement that dumps its usage before switching to relocated heap
in spl_relocate_stack_gd() via CONFIG_SPL_STACK_R_MALLOC_SIMPLE_LEN.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2019-02-28 14:21:46 -05:00
Stephen Warren
8422ad5165 kbuild: fix DTB .cmd source variable
*.dts are processed using a custom command, then the C pre-processor is
run on them, then they are compiled using dtc. Thus, the dependency
files generated by both cpp and dtc reference a temporary file name
rather than the actual source file. While this information isn't used
for any purpose by the build system, and hence this causes no functional
issue, it does cause the dependency files to contain invalid and
confusing data, which is unhelpful while debugging build problems. Fix
this using sed.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2019-02-28 14:21:46 -05:00
Stephen Warren
2737dfe096 kbuild: make arch-dtbs target PHONY
Without this, the arch-dtbs target only gets evaluated when building
U-Boot the first time, not when re-building (incrementally building)
U-Boot. Thus incremental builds ignore changes to DTB files.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2019-02-28 14:21:46 -05:00
Patrick Delaunay
3a29afcbbf doc: binding: rename directory ram to memory-controller
Alignment with kernel directory name as it have already bindings for
DDR controllers in the directory:
Documentation/devicetree/bindings/memory-controller

PS: the drivers using RAM u-class should be associated with
    this binding directory

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
2019-02-28 14:21:46 -05:00
Heinrich Schuchardt
7274b7638a fs: fat: fix link error when building with DEBUG=1
When compiling with DEBUG=1 an error
fs/fat/fat_write.c:831: undefined reference to `__aeabi_ldivmod'
occurred.

We should use do_div() instead of the modulus operator.

filesize and cur_pos cannot be negative. So let's use u64 to avoid
warnings.

Fixes: cb8af8af5b ("fs: fat: support write with non-zero offset")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-02-28 14:21:46 -05:00
Felix Brack
a319229fda arm: pdu001: Fix order of include files
Fix the order of include files according to U-Boot coding style.

Signed-off-by: Felix Brack <fb@ltec.ch>
2019-02-28 14:21:46 -05:00
Michal Simek
0a8573052a .gitignore: Ignore regenerated *.dtbo files
*.dtbo are dt overlays files which should be also ignored as *.dtb.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2019-02-28 14:21:46 -05:00
Marek Vasut
86dc480d73 ARM: cache: Fix incorrect bitwise operation
The loop implemented in the code is supposed to check whether the
PL310 operation register has any bit from the mask set. Currently,
the code checks whether the PL310 operation register has any bit
set AND whether the mask is non-zero, which is incorrect. Fix the
conditional.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Dalon Westergreen <dwesterg@gmail.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Tom Rini <trini@konsulko.com>
Fixes: 93bc21930a ("armv7: add PL310 support to u-boot")
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Reviewed-by: Dinh Nguyen <dinguyen@kernel.org>
2019-02-28 14:21:46 -05:00
David Rivshin
b8b88e6aff spi: omap3: fix set_wordlen() reading from incorrect address for CHCONF
_omap3_spi_set_wordlen() indexed the regs->channel[] array with the
old wordlen (instead of the chipselect number) when reading the current
CHCONF register value. This meant it read from the wrong memory location,
modified that value, and then wrote it back to the correct CHCONF
register. The end result is that most slave configuration settings would
be lost, such as clock divisor, clock/chipselect polarities, etc.

Fixes: 77b8d04854 ("spi: omap3: Convert to driver model")
Signed-off-by: David Rivshin <drivshin@allworx.com>
2019-02-28 14:21:46 -05:00
Tom Rini
783e66816d Merge git://git.denx.de/u-boot-riscv
- SiFive FU540 Support
2019-02-27 13:32:09 -05:00
Anup Patel
98a66ffa3a riscv: Enable CONFIG_SYS_BOOT_RAMDISK_HIGH for using initrd
This patch enables CONFIG_SYS_BOOT_RAMDISK_HIGH for RISC-V
because bootm will update initrd location in DTB only if
CONFIG_SYS_BOOT_RAMDISK_HIGH is enabled. If we don't enable
this option then bootm assumes DTB already has initrd details
which is not the case most of the time.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
2019-02-27 09:12:34 +08:00
Atish Patra
8ad2104589 doc: Add a readme guide for SiFive FU540
The readme guide describes the procedure to build, flash and boot Linux
using U-Boot on HiFive Unleashed. It also explains the current state of
U-boot support and future action items.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
2019-02-27 09:12:33 +08:00
Anup Patel
3fda0262c3 riscv: Add SiFive FU540 board support
This patch adds SiFive FU540 board support. For now, only
SiFive serial, SiFive PRCI, and Cadance MACB drivers are
only enabled. The SiFive FU540 defconfig by default builds
U-Boot for S-Mode because U-Boot on SiFive FU540 will run
in S-Mode as payload of BBL or OpenSBI.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2019-02-27 09:12:33 +08:00
Atish Patra
007056f495 cpu: Bind timer driver for boot hart
Currently, timer driver is bound only for hart0.

There is no mandatory requirement that hart0 should always
come up. In fact, HiFive Unleashed SoC hart0 doesn't boot
in S-mode because it only has M-mode.

The timer driver should be bound for boot hart.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2019-02-27 09:12:33 +08:00
Atish Patra
ee0633ef8b drivers: serial_sifive: Skip baudrate config if no input clock
It is possible that input clock is not available because clk
device was not available and 'clock-frequency' DT property is
also not available.

In this case, instead of failing we should just skip baudrate
config by returning zero.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
2019-02-27 09:12:33 +08:00
Atish Patra
a3682008a0 drivers: serial_sifive: Fix baud rate calculation
Compute the baud rate multipler with more precision.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
2019-02-27 09:12:33 +08:00
Anup Patel
b630d57d0a clk: Add fixed-factor clock driver
This patch adds fixed-factor clock driver which derives clock
rate by dividing (div) and multiplying (mult) fixed factors
to a parent clock.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2019-02-27 09:12:33 +08:00
Anup Patel
c40b6df87f clk: Add SiFive FU540 PRCI clock driver
Add driver code for the SiFive FU540 PRCI IP block.  This IP block
handles reset and clock control for the SiFive FU540 device and
implements SoC-level clock tree controls and dividers.

Based on code written by Wesley Terpstra <wesley@sifive.com>
found in commit 999529edf517ed75b56659d456d221b2ee56bb60 of:
https://github.com/riscv/riscv-linux

Boot and PLL rate change were tested on a SiFive HiFive Unleashed
board.

Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
2019-02-27 09:12:33 +08:00
Atish Patra
fbcaa260e5 net: macb: Fix GEM hardware detection
Fix MID bit field check to correctly identify all GEM hardwares.

The check is updated as per macb driver in Linux location:
<linux_sources>/drivers/net/ethernet/cadence/macb_main.c:259

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
2019-02-27 09:12:33 +08:00
Anup Patel
2e242f5f43 net: macb: Fix clk API usage for RISC-V systems
Don't fail in macb_enable_clk() if clk_enable() returns
-ENOSYS because we get -ENOSYS for fixed-rate clocks.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2019-02-27 09:12:33 +08:00
Anup Patel
26f4fd1cb4 riscv: generic: Ensure that U-Boot runs within 4GB for 64bit systems
On 64bit systems, the DRAM top can be easily beyond 4GB and U-Boot
DMA mapping APIs will generate DMA addresses beyond 4GB. This
breaks DMA programming in 32bit DMA capable devices (such as
Cadence MACB ethernet). For example, If DRAM is more then 2GB
on QEMU sifive_u machine then Cadence MACB ethernet stops working
for U-Boot because it is a 32bit DMA capable device.

To handle 32bit DMA capable devices on 64bit systems, we provide
custom implementation of board_get_usable_ram_top() which ensures
that usable ram top is not more then 4GB. This in-turn ensures
that U-Boot always runs within 4GB hence DMA addresses generated
by DMA mapping APIs will be within 4GB too.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2019-02-27 09:12:33 +08:00