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Pali Rohár 913866af6c tools: kwboot: Use separate thread for sending boot message pattern 
After BootROM successfully detects boot message pattern on UART it waits
until host stop sending data on UART. For example Armada 385 BootROM
requires that host does not send anything on UART at least 24 ms. If host
is still sending something then BootROM waits (possibly infinitely).

BootROM successfully detects boot message pattern if it receives it in
small period of time after power on.

So to ensure that host put BootROM into UART boot mode, host must send
continuous stream of boot message pattern with a small gap (for A385 at
least 24 ms) after series of pattern. But this gap cannot be too often or
too long to ensure that it does not cover whole BootROM time window when it
is detecting for boot message pattern.

Therefore it is needed to do following steps in cycle without any delay:
1. send series of boot message pattern over UART
2. wait until kernel transmit all data
3. sleep small period of time

At the same time, host needs to monitor input queue, data received on the
UART and checking if it contains NAK byte by which BootROM informs that
xmodem transfer is ready.

But it is not possible to wait until kernel transmit all data on UART and
at the same time in the one process to also wait for input data. This is
limitation of POSIX tty API and also by linux kernel that it does not
provide asynchronous function for waiting until all data are transmitted.
There is only synchronous variant tcdrain().

So to correctly implement this handshake on systems with linux kernel, it
is needed to use tcdrain() in separate thread.

Implement sending of boot message pattern in one thread and reading of
reply in the main thread. Use pthread library for threads.

This change makes UART booting on Armada 385 more reliable. It is possible
to start kwboot and power on board after minute and kwboot correctly put
board into UART boot mode.

Old implementation without separate thread has an issue that it read just
one byte from UART input queue and then it send 128 message pattern to the
output queue. If some noise was on UART then kwboot was not able to read
BootROM response as its input queue was just overflowed and kwboot was
sending more data than receiving.

This change basically fixed above issue too.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-by: Stefan Roese <sr@denx.de>
2022-03-04 13:12:06 +01:00
..
binman binman: Allow different operations in FIT generator nodes 2022-02-22 10:05:44 -07:00
buildman patman: Convert camel case in terminal.py 2022-02-09 12:30:13 -07:00
concurrencytest concurrencytest: Fix Python3 warning 2021-01-05 12:26:35 -07:00
docker Dockfile, CI: Update to latest focal tag and build 2022-02-03 12:15:32 -05:00
dtoc dtoc: Support reading a list of arguments 2022-02-22 10:05:44 -07:00
env fw_env: simplify logic & code paths in the fw_env_open() 2022-02-11 11:29:23 -05:00
gdb SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
kermit SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
libfdt libfdt: migrate fdt_ro.c to a wrapper of scripts/dtc/libfdt/fdt_ro.c 2020-04-26 14:23:39 -06:00
logos video: theadorable: Use RGB565 for BMP blitting 2021-12-26 23:23:52 +01:00
omap SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
patman patman: Convert camel case in terminal.py 2022-02-09 12:30:13 -07:00
scripts tools: fix define2mk.sed to not add quotes around negative integers 2016-06-13 07:46:29 +09:00
.gitignore tools: add mkeficapsule to .gitignore 2021-01-29 20:22:40 +01:00
aisimage.c tool: aisimage: use ALIGN instead of self defiend macro 2020-04-24 10:10:00 -04:00
aisimage.h SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
asn1_compiler.c WS cleanup: remove trailing white space 2021-09-30 08:08:56 -04:00
atmel_pmecc_params.c SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
atmelimage.c SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
bmp_logo.c bmp_logo: support CONFIG_DM_VIDEO 2019-07-29 00:20:31 +02:00
default_image.c crc32: Use the crc.h header for crc functions 2019-12-02 18:23:08 -05:00
dumpimage.c tools: mkimage/dumpimage: Allow to use -l with -T 2022-02-28 10:33:11 -05:00
dumpimage.h SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
eficapsule.h tools: mkeficapsule: add firmware image signing 2022-02-11 20:07:55 +01:00
efivar.py tools: efivar.py unused variable 2021-01-13 02:38:00 +01:00
endian-swap.py tools: add script for byte endianness swapping 2020-06-29 22:36:35 +02:00
envcrc.c crc32: Use the crc.h header for crc functions 2019-12-02 18:23:08 -05:00
fdt_host.h tools: Improve comments in signing functions 2022-01-26 08:50:43 -07:00
fdtgrep.c fdtgrep: Correct alignment of struct section 2021-12-17 09:44:59 -07:00
file2include.c tools/file2include: don't use malloc.h for malloc 2018-11-26 22:52:12 -05:00
fit_check_sign.c fit_check_sign: Update help to mention the key is in a dtb 2022-01-26 08:50:42 -07:00
fit_common.c tools: mkimage: Show where signatures/keys are written 2022-01-26 08:50:44 -07:00
fit_common.h tools: mkimage: Show where signatures/keys are written 2022-01-26 08:50:44 -07:00
fit_image.c tools: mkimage: Show where signatures/keys are written 2022-01-26 08:50:44 -07:00
fit_info.c tools: use read-only mmap in fit_check_sign 2019-05-18 12:32:02 -04:00
gen_eth_addr.c SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
gen_ethaddr_crc.c SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
genboardscfg.py genboardscfg: limit to 240 jobs 2022-01-13 09:13:41 -07:00
getline.c SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
getline.h
gpheader.h SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
gpimage-common.c SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
gpimage.c SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
ifdtool.c doc: replace @return by Return: 2022-01-19 18:11:34 +01:00
ifdtool.h SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
ifwitool.c tool: Move ALIGN_MASK to header as common MACRO 2020-04-24 10:10:00 -04:00
image-host.c tools: mkimage: Show where signatures/keys are written 2022-01-26 08:50:44 -07:00
image-sig-host.c rsa: adds rsa3072 algorithm 2022-01-28 17:58:41 -05:00
imagetool.c tools: mkimage/dumpimage: Allow to use -l with -T 2022-02-28 10:33:11 -05:00
imagetool.h tools: mkimage/dumpimage: Allow to use -l with -T 2022-02-28 10:33:11 -05:00
img2srec.c treewide: remove unneeded semicolons 2017-06-16 10:11:38 -04:00
imx8image.c tools: imx image: fix write warning 2021-04-08 09:18:29 +02:00
imx8m_image.sh tools: imx8m_image: Support ddr3 firmware 2021-10-21 13:59:26 +02:00
imx8mimage.c tools: imx8mimage: not abort when mmap fail 2021-10-07 17:45:00 +02:00
imx_cntr_image.sh tools: improve portability of imx_cntr_image.sh 2019-01-01 14:12:18 +01:00
imximage.c tools/imximage: fix DCD Blocks message output order 2020-08-18 10:10:25 +02:00
jtagconsole
k3_fit_atf.sh tools: k3_fit_atf: Fix DM binary FIT load addresses 2021-09-10 20:10:20 -04:00
k3_gen_x509_cert.sh tools: k3_gen_x509_cert: Set default early HS JTAG access to disabled 2020-06-13 23:12:17 +05:30
Kconfig tools: build mkeficapsule with tools-only_defconfig 2022-02-11 20:07:55 +01:00
kwbimage.c tools: kwbimage: Add me as an author of kwbimage 2022-02-17 14:17:07 +01:00
kwbimage.h tools: kwbimage: Add support for dumping extended and binary v0 headers 2022-02-17 14:17:07 +01:00
kwboot.c tools: kwboot: Use separate thread for sending boot message pattern 2022-03-04 13:12:06 +01:00
lpc32xximage.c SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
Makefile tools: kwboot: Use separate thread for sending boot message pattern 2022-03-04 13:12:06 +01:00
microcode-tool x86: Add a script to process Intel microcode files 2014-12-18 17:26:08 -07:00
microcode-tool.py microcode_tool: Convert to Python 3 2019-11-04 18:15:32 -07:00
mips-relocs.c MIPS: make size of relocation table fixed but configurable 2018-11-02 22:39:07 +01:00
mkeficapsule.c tools: mkeficapsule: remove duplicated code 2022-02-26 07:37:00 +01:00
mkenvimage.c crc32: Use the crc.h header for crc functions 2019-12-02 18:23:08 -05:00
mkexynosspl.c SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
mkimage.c tools: mkimage/dumpimage: Allow to use -l with -T 2022-02-28 10:33:11 -05:00
mkimage.h image: Adjust the workings of fit_check_format() 2021-02-15 22:31:52 -05:00
mksunxiboot.c tools: mksunxiboot: Use sunxi_image header directly 2021-10-25 14:49:58 +01:00
moveconfig.py moveconfig: Allow regex matches when finding combinations 2022-02-22 10:05:44 -07:00
mrvl_uart.sh SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
mtk_image.c tools: mtk_image: add an option to set device header offset 2021-03-20 16:24:27 -04:00
mtk_image.h tools: mtk_image: add support for booting ARM64 images 2021-01-18 14:59:29 -05:00
mxsboot.c SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
mxsimage.c tools/mxsimage: Remove fclose on empty FILE pointer 2022-02-05 13:38:39 +01:00
mxsimage.h SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
ncb.c
netconsole tools/netconsole: Add support for socat 2021-12-02 08:34:01 +02:00
omapimage.c SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
omapimage.h SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
os_support.c tools: Remove the out-of-date MinGW support codes 2020-04-24 10:51:56 -04:00
os_support.h tools: Remove the out-of-date MinGW support codes 2020-04-24 10:51:56 -04:00
pbl_crc32.c crc32: Use the crc.h header for crc functions 2019-12-02 18:23:08 -05:00
pbl_crc32.h SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
pblimage.c tools: pblimage: fix image header verification function 2022-02-28 12:01:02 +05:30
pblimage.h tools: pblimage: fix image header verification function 2022-02-28 12:01:02 +05:30
prelink-riscv.c riscv: tools: Add big endian target support to prelink-riscv 2019-08-15 13:42:28 +08:00
prelink-riscv.inc riscv: tools: Handle addend to absolute reloc in prelink-riscv 2019-09-03 09:30:32 +08:00
proftool.c command: Remove the cmd_tbl_t typedef 2020-05-18 18:36:55 -04:00
relocate-rela.c arm64: relocate-rela: Add support for ld.lld 2021-11-15 14:33:32 -05:00
rkcommon.c rockchip: mkimage: Add support for rk3568 SoC 2021-12-24 18:30:08 +08:00
rkcommon.h doc: replace @return by Return: 2022-01-19 18:11:34 +01:00
rkimage.c rockchip: mkimage: fix wrong range of rc4 encoding for boot image 2019-12-27 15:17:07 +08:00
rkmux.py rkmux: Convert to Python 3 2019-11-04 18:15:32 -07:00
rksd.c rockchip: mkimage: support packing optional second level boot-loader 2019-12-27 15:17:07 +08:00
rkspi.c rockchip: mkimage: support packing optional second level boot-loader 2019-12-27 15:17:07 +08:00
rmboard.py patman: Convert camel case in command.py 2022-02-09 12:26:12 -07:00
socfpgaimage.c tools: socfpgaimage: update padding flow 2021-01-15 17:48:39 +08:00
spl_size_limit.c imx: replace CONFIG_SECURE_BOOT with CONFIG_IMX_HAB 2019-10-08 16:36:37 +02:00
stm32image.c tools: mkimage: fix STM32 image format for big endian hosts 2020-02-13 17:32:09 +01:00
sunxi-spl-image-builder.c tools: sunxi: avoid read after end of string 2017-05-05 16:45:57 -04:00
sunxi_egon.c mkimage: sunxi_egon: Allow overriding the padding size 2022-01-30 01:25:00 +00:00
termios_linux.h tools: termios_linux.h: Fix tcsendbreak() implementation 2021-10-21 07:39:05 +02:00
ublimage.c SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
ublimage.h SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
ubsha1.c SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
update_octeon_header.c mips: octeon: tools: Add update_octeon_header tool 2020-11-30 18:32:09 +01:00
vybridimage.c SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
xway-swap-bytes.c
zynqimage.c SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
zynqmp_pm_cfg_obj_convert.py tools/zynqmp_pm_cfg_obj_convert.py: fix build with Vivado 2021.x 2022-02-15 12:41:00 +01:00
zynqmp_psu_init_minimize.sh arm64: zynqmp: Do not remove dpll_prog from psu_init 2019-10-24 13:37:02 +02:00
zynqmpbif.c tools: zynqmpbif: Use compiler builtin instead of linux-specific __swab32 2019-10-28 13:32:51 -04:00
zynqmpimage.c tools: zynqmpimage: Add bif support 2018-05-11 09:23:44 +02:00
zynqmpimage.h SPDX: Correct SPDX tags from recent xilinx merge 2018-05-11 14:54:57 -04:00