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Remove redundant chapters, clarify and reword confusing sections.
Signed-off-by: Svyatoslav Ryhel <[email protected]>
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Flashing U-Boot for Exynos 7870 requires creating a stub device tree,
where certain properties and nodes are defined which are populated by
the previous bootloader in the phones.
Since these properties are now available in the U-Boot device tree, it's
now possible to use the same blob generated by U-Boot in place of the
stub, when creating boot images. Update the build documentation to
reflect the same.
Signed-off-by: Kaustabh Chakraborty <[email protected]>
Signed-off-by: Minkyu Kang <[email protected]>
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U-Boot for this board is programmed to use the external DTB if an
internal device tree is not available. This makes it safe to build boot
images using the non-DTB U-Boot binary, while taking up less space.
Reflect this change in documentation.
Signed-off-by: Kaustabh Chakraborty <[email protected]>
Signed-off-by: Minkyu Kang <[email protected]>
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Since there is only one internal device tree allowed in U-Boot, the
DEVICE_TREE flag is required for building images for various devices.
Document it in the build guide.
Signed-off-by: Kaustabh Chakraborty <[email protected]>
Signed-off-by: Minkyu Kang <[email protected]>
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- Assorted updates
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Document the image preparation and flashing techniques for
Exynos7870-based boards. This is done in a separate file in a
sub-directory, which is linked back to the main documentation.
Signed-off-by: Kaustabh Chakraborty <[email protected]>
Signed-off-by: Minkyu Kang <[email protected]>
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Add support for a generic platform which intends to support multiple
boards powered by ARMv8 Samsung Exynos SoCs. Some important features
include:
* Fastboot: This is present to provide an open alternative to Samsung's
proprietary Odin protocol. The board file configures certain features
for fastboot, such as a dynamically allocated fastboot buffer, and
standardized (lowercase) partition aliases.
* EFI: Kernel image can be loaded from an EFI partition. This
adopts a standard booting process, which multiple OS distributions
can rely on.
Signed-off-by: Kaustabh Chakraborty <[email protected]>
Signed-off-by: Minkyu Kang <[email protected]>
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As stated in PXELINUX doc [1], the PXE configuration file has to be in
the format of "01-MAC-address" for Ethernet connections:
The hardware type (using its ARP "htype" code) and address, all in
lowercase hexadecimal with dash separators. For example, for an
Ethernet (i.e. ARP hardware type "1") with address
"88:99:AA:BB:CC:DD", it would search for the filename
"01-88-99-aa-bb-cc-dd".
Indeed, PXE implementation in U-Boot looks for files like that, as can
be seen from this call chain:
format_mac_pxe()
pxe_mac_path()
pxe_get()
extlinux_pxe_read_bootflow()
Mention the fact that PXE expects the configuration file to be prepended
with "01" in the PXE section of E850-96 documentation. While at it, fix
some other minor issues in PXE section.
[1] https://wiki.syslinux.org/wiki/index.php?title=PXELINUX
Signed-off-by: Sam Protsenko <[email protected]>
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Add more bootloading details for E850-96 board. New sections cover next
topics:
- Hardware configuration of the boot device
- Flashing and updating the software (multiple methods)
- Booting with Standard Boot (multiple methods)
- EFI System Partition structure for E850-96
- Loadable firmware (LDFW) note
- Ethernet and USB Host Support
That documents all recently enabled U-Boot features for E850-96, which
can hopefully make U-Boot more useful for the users and developers of
this platform.
Signed-off-by: Sam Protsenko <[email protected]>
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(SGH-i927) support
The Galaxy R (GT-I9103) and Captivate Glide (SGH-i927) are both Tegra 2
based Samsung smartphones released in 2011. They both feature 1 GB of RAM
and 8 GB of expandable flash memory. The key difference is that the
Captivate Glide has an OLED panel (contrary to LCD in Galaxy R) and a
QWERTY keyboard in form factor of a slider.
Signed-off-by: Ion Agorria <[email protected]>
Reviewed-by: Svyatoslav Ryhel <[email protected]>
Signed-off-by: Svyatoslav Ryhel <[email protected]>
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Now that USB is enabled on the E850-96 board, DFU and fastboot tools are
functional and can be used to flash images to eMMC. Update the E850-96
documentation accordingly and describe flashing to User Data Area and
Boot HW Partition of eMMC using fastboot and DFU tools.
Signed-off-by: Sam Protsenko <[email protected]>
Signed-off-by: Minkyu Kang <[email protected]>
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eMMC is enabled on E850-96 board now. Mention that in the board
documentation.
Signed-off-by: Sam Protsenko <[email protected]>
Signed-off-by: Minkyu Kang <[email protected]>
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Add support for WinLink E850-96 board [1]. It's based on Exynos850 SoC
and follows 96boards specification, so it's compatible with 96boards
mezzanine boards [2]. This patch enables next features:
* Serial console
* USI
* PMU (muxing AP UART path)
* Pinctrl
* Clocks
* Timer (ARMv8 architected)
* Reset control
It's quite a minimal enablement. Features like MMC, USB and Ethernet
will be enabled later.
The rationale for config values is as follows:
* TEXT_BASE = 0xf8800000
That's where BL2 loads the U-Boot payload, so TEXT_BASE must be
exactly this value. Overall the memory map is designed in a way to
keep the bootloader in the upper 128 MiB area of RAM, which is
0xf8000000..0xffffffff. That includes bootloader's code, stack,
data, heap, MMU tables, etc. All the memory below that 128 MiB chunk
can be used for storing boot images (0x80000000..0xf8000000).
* CUSTOM_SYS_INIT_SP_ADDR = 0xf8c00000
Just 4 MiB above the TEXT_BASE address, to leave enough space for
U-Boot code and stack itself (grows downwards).
* SYS_LOAD_ADDR = 0x80000000
The beginning of RAM. That's where Linux kernel image must be
loaded.
* SYS_MALLOC_LEN = 0x81f000
8 MiB for malloc() + ENV_SIZE (128 KiB)
* SYS_MALLOC_F_LEN = 0x4000
Increase malloc() pool size available before relocation from 8 KiB
(default) to 16 KiB. Otherwise "alloc space exhausted" message
appears in U-Boot log during board_init_f() stage. There are next
reasons for doing so:
1. Having "bootph-all" flags in some dts nodes leads to binding
those during pre-relocation stage, and binding (DM) uses
dynamic memory allocation
2. clk-exynos850 driver uses CCF clocks, which in turn use dynamic
memory allocation
Device tree file was imported from Linux kernel. All nodes and boot
phase flags added in exynos850-e850-96-u-boot.dtsi are only needed to
enable serial console:
* oscclk -> cmu_top -> cmu_peri: generate UART/USI clocks
* pinctrl_alive and uart1_pins: needed to mux UART pins
* pmu_system_controller: configures AP UART path to uart1_pins
* usi_uart: configures USI block to operate as a UART protocol
* serial_0: enables serial console (UART)
[1] https://www.96boards.org/product/e850-96b/
[2] https://www.96boards.org/products/mezzanine/
Signed-off-by: Sam Protsenko <[email protected]>
Signed-off-by: Minkyu Kang <[email protected]>
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Title underlines should match the length of the title. Unfortunately
docutils only catches underlines that are too short.
Add some missing empty lines after titles.
Signed-off-by: Heinrich Schuchardt <[email protected]>
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U-boot is intended to replace linux kernel in android boot image(ABL), and
it's FIT payload to replace initramfs file. The boot process is similar to
boot image with linux:
- android bootloader (ABL) unpacks android boot image
- ABL sets `linux,initrd-start property` in chosen node in unpacked FDT
- ABL sets x0 register to FDT address, and passes control to u-boot
- u-boot reads x0 register, and stores it in `prevbl_fdt_addr` env variable
- u-boot reads `linux,initrd-start` property,
and stores it in `prevbl_initrd_start_addr`
In this way, u-boot bootcmd relies on `prevbl_initrd_start_addr` env
variable, and boils down to `bootm $prevbl_initrd_start_addr`.
If more control on boot process is desired, pack a boot script in
FIT image, and put it to default configuration
What done:
- Rearrange defconfig option order
- Add CONFIG_SAVE_PREV_BL_* options
- Doc updates:
- remove wrong SBOOT memory corruption note, because
memory is changed during u-boot bringup process,
not by SBOOT
- put payload on ramdisk place in abl boot image
creation step
Signed-off-by: Dzmitry Sankouski <[email protected]>
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A few sections had underlines that were too short, correct.
Signed-off-by: Tom Rini <[email protected]>
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Model names are SM-A{3,5,7}20, just SM-{3,5,7}20 could also refer to
SM-J{3,5,7}20 or SM-T{3,5,7}20.
Fixes: 3e2095e960b4 ("board: samsung: add support for Galaxy A series
of 2017 (a5y17lte)")
Signed-off-by: Henrik Grimler <[email protected]>
Reviewed-by: Dzmitry Sankouski <[email protected]>
Reviewed-by: Jaehoon Chung <[email protected]>
Signed-off-by: Minkyu Kang <[email protected]>
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Samsung Galaxy A3, A5, A7 (2017) - middle class Samsung smartphones.
U-boot can be used as chain-loaded bootloader to gain control
on booting vanilla linux(and possibly others) kernels
Signed-off-by: Dzmitry Sankouski <[email protected]>
Cc: Minkyu Kang <[email protected]>
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