In case of Android boot, reboot reason can be written into BCB (usually
it's an area in 'misc' partition). U-Boot then can obtain that reboot
reason from BCB and handle it accordingly to achieve correct Android
boot flow, like it was suggested in [1]:
- if it's empty: perform normal Android boot from eMMC
- if it contains "bootonce-bootloader": get into fastboot mode
- if it contains "boot-recovery": perform recovery boot
The latter is not implemented yet, as it depends on some features that
are not implemented on TI platforms yet (in AOSP and in U-Boot).
[1] https://marc.info/?l=u-boot&m=152508418909737&w=2
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
ttyO2 console enables legacy CONFIG_SERIAL_OMAP driver in kernel.
Nowadays it's preferred to use the generic CONFIG_SERIAL_8250_OMAP
driver, which being enabled via ttyS2 console. Both drivers are enabled
in multi_v7_defconfig and in omap2plus_defconfig, for compatibility
reasons. Let's switch to ttyS2 console, to be sure that standard 8250
serial driver is used.
Similar behavior can be also achieved by enabling
CONFIG_SERIAL_8250_OMAP_TTYO_FIXUP option in kernel, but it's better not
to rely on that, as it can be disabled or removed after transitional
period.
Right now on DRA7/AM57x platforms the 8250-omap driver is being probed
first, and omap-serial driver is only probed if the first one failed.
It can be seen from uart3 definition in arch/arm/boot/dts/dra7-l4.dtsi:
compatible = "ti,dra742-uart", "ti,omap4-uart";
So the kernel already uses 8250 driver. This change basically allows
kernel developers to throw away the omap-serial driver and associated
compatibility options. Similar discussions [1,2] have started several
years ago, so it should be safe to do that now.
[1] https://patchwork.kernel.org/patch/6198471/
[2] http://processors.wiki.ti.com/index.php/Sitara_Linux_UART_-_Switching_to_8250_Driver
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Andrew F. Davis <afd@ti.com>
[trini: Update omap5_uevm]
Signed-off-by: Tom Rini <trini@konsulko.com>
Add support for A/B boot process on AM57xx based boards:
1. Define 'slot_suffix' variable (using 'ab_select' command)
2. Extend 'emmc_android_boot' boot command (add commands for A/B boot
process)
'ab_select' command is used to decide which slot should be used for
booting up. A/B metadata resides in 'misc' partition.
To activate the A/B boot process, the following config options must be
set:
CONFIG_ANDROID_AB=y
CONFIG_CMD_AB_SELECT=y
For successful A/B boot, the corresponding A/B infrastructure must be
involved on Android side [1] (including mounting system as root), and
disk must be partitioned accordingly.
When A/B boot is enabled, there are some known limitations currently
exist (not related to A/B patches, need to be implemented later):
1. The 'Verified Boot' sequence is not supported
2. dev path to system partition (system_a or system_b) is passed via
'bootargs' as 'root=' argument like 'root=/dev/mmcblk1p12', but
further we'll need to rework it with respect to dm-verity
requirements [2]
In case when A/B partitions are not present in system (and A/B boot is
enabled), boot up process will be terminated and next message will be
shown:
"boot_a(b) partition not found"
[1] https://source.android.com/devices/tech/ota/ab
[2] https://source.android.com/devices/tech/ota/ab/ab_implement#kernel
Signed-off-by: Ruslan Trofymenko <ruslan.trofymenko@linaro.org>
Signed-off-by: Igor Opaniuk <igor.opaniuk@gmail.com>
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Alistair Strachan <astrachan@google.com>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Remove unused Android partitions:
- efs, crypto, cache: we don't use it anymore (images are not built
in AOSP
- ipu1, ipu2: IPU firmware is now a part of vendor image and doesn't
reside as a separate partition
While at it, rename "reserved" partition to "uboot-env", as it's
actually stores U-Boot environment.
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Praneeth Bajjuri <praneeth@ti.com>
Android code base is growing, so since Android "Pie" the size of
system.img grew up to be about 740 MiB. Let's increase system.img to
1 GiB to accommodate for those changes and leave some margin for future
changes. We don't want to make it more than 1 GiB, because we should
keep userdata partition big enough (for user files, like media etc.),
and eMMC size on BeagleBoard-X15 is only 3.5 GiB.
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Acked-by: Praneeth Bajjuri <praneeth@ti.com>
Recent removal of obsolete partition led to shifting of starting address
of "reserved" partition (which reflects U-Boot environment). Fix its
start address to keep it in sync with ENV_OFFSET and DFU environment.
This patch also provides fixed start address for "reserved" partition,
so that we can track when it's shifted next time.
While at it, move it before "misc" partition to keep all Android
partitions together.
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Acked-By: Praneeth Bajjuri <praneeth@ti.com>
This part should've been remove in commit 88d60db011 ("arm: ti: boot:
Remove environment partition"), but I missed it somehow. Remove reading
dtb file from environment partition on eMMC, as we don't have it
anymore.
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Remove "environment" partition and do not read it when booting Android
from eMMC. We don't use this partition anymore, so this is just an
unintentional leftover.
Earlier we were reading dtb file from "environment" partition to feed it
further to kernel. Now we are using dtb from FIT image ("boot" partition
contains boot_fit.img image), which can be seen from this command:
bootm ${loadaddr}#${fdtfile}
where "#" character means we have FIT image in ${loadaddr} RAM address.
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Acked-by: Praneeth Bajjuri <praneeth@ti.com>
1. Add vbmeta partition info to android partition layout for TI
platforms.
2. Add support of AVB 2.0 (including avb subset of commands) for am57xx HS
Signed-off-by: Igor Opaniuk <igor.opaniuk@linaro.org>
[trini: Move to include/environment/ti/boot.h, reword commit slightly]
Signed-off-by: Tom Rini <trini@konsulko.com>
Eliminate code duplication: the same PARTS_DEFAULT was defined in
am57xx_evm.h and in dra7xx_evm.h. Extract it to environment/boot.h and
use in all OMAP5-based boards.
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Boot android over emmc by default thru FIT image
Signed-off-by: Praneeth Bajjuri <praneeth@ti.com>
Suggested-by: Andrew F.Davis <afd@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from. So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry. Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.
In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.
This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents. There's also a few places where I found we did not have a tag
and have introduced one.
Signed-off-by: Tom Rini <trini@konsulko.com>
Get the start address and the size of partitions using partition names
rather than partition numbers. This way we can change the partition
table further without changing the boot code.
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Add tracing printings to Linux/Android boot commands, so that we can see
what's going on. Helps to trace possible bugs on early stages and
improves the output for user (which is especially useful, because we
have a bunch of boot commands executing one by one).
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Extract commands for booting Linux from eMMC to separate command. It
seems more logical that way, and allows us to run the whole command set
from U-Boot shell with only one command.
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
