openwrt/target/linux/ipq806x/patches-5.4/900-arm-add-cmdline-override.patch
Christian Lamparter 98b86296e6 ipq806x: add support for ASRock G10
The ASRock G10 is a 2.4/5 GHz band 11ac "Gaming" router,
based on Qualcomm IPQ8064.

Specifications:

SoC:	Qualcomm IPQ8064
CPU:	Dual-Core A15 @ (384 - 1,400 MHz, 2C2T)
DRAM:	512 MiB (~467 MiB available)
NAND:	128 MB (Micron MT29F1G08ABBEAH4)
WLAN0:	4T4R 5 GHz Wlan (QCA9980)
WLAN1:	4T4R 2.4 GHz Wlan (QCA9980)
ETH:    5x 10/100/1000 Mbps Ethernet (QCA8337)
INPUT:  Reset Button, WPS 2.4G and WPS 5G Button
LEDS:   1 multicolor status LED
USB:    2x USB 3.0 Type-A
POWER:  12VDC/3A AC Adapter + dedicated Power Switch
UART:   Setting is 115200-8-N-1. 1x4 .1" unpopulated header
	on the PCB (J6 - very tiny silkscreen next to TX).
        Pinout: 1. 3v3 (Square - best skipped!), 2. RX, 3. GND, 4. TX

WARNING: The serial port needs a TTL/RS-232 3.3v level converter!
	 (Depending on the serial adapter RX and TX might need to
	  be swapped).

Note about the IR-Remote:
There's a 8-Bit MCU (SONIX SN8F25E21SG) which is controlling the
IR-Remote and is fed by the IR-Photodiode. The SoC can talk to
the device via I2C. The vendor's GPL archive comes with the source
of the interface driver for this as a (character driver), the main
control software is however a blob.

Installation Instructions:
 1. Download factory image to disk
 2. Apply factory image via stock web-gui

Back to stock:
 1. Login to router via ssh
 2. run "asrock_g10_back_to_factory" script from /sbin

Notes:
 - If something goes wrong durring sysupgrade, router will go back to
   factory image.
 - Asrock G10 uses partition layout from smem. So partition layout can
   be normal or alternate.
 - 900-arm-add-cmdline-override.patch was copied from 102-powerpc-add-cmdline-override.patch
   from powerpc target.

Knowledge about BOOTCONFIG partition was based on user "jmomo" post from old
OpenWrt forum (Post #50):
https://forum.archive.openwrt.org/viewtopic.php?id=65956&p=2

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
[bump to 5.4, add factory image, fix sysupgrade, convert partition
layout to smem, remove ipq-wifi-asrock-g10 and use ART, minor fixes]
Co-Authored-by: Pawel Dembicki <paweldembicki@gmail.com>
Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
Tested-by: Lukasz Ostapiuk <palibrzuch@gmail.com>
2020-12-22 19:11:50 +01:00

38 lines
1.3 KiB
Diff

--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1836,6 +1836,14 @@ config ARM_ATAG_DTB_COMPAT_CMDLINE_MANGL
Only command line ATAG will be processed, the rest of the ATAGs
sent by bootloader will be ignored.
+config CMDLINE_OVERRIDE
+ bool "Use alternative cmdline from device tree"
+ help
+ Some bootloaders may have uneditable bootargs. While CMDLINE_FORCE can
+ be used, this is not a good option for kernels that are shared across
+ devices. This setting enables using "chosen/cmdline-override" as the
+ cmdline if it exists in the device tree.
+
endchoice
config CMDLINE
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -1060,6 +1060,17 @@ int __init early_init_dt_scan_chosen(uns
if (p != NULL && l > 0)
strlcpy(data, p, min(l, COMMAND_LINE_SIZE));
+ /* CONFIG_CMDLINE_OVERRIDE is used to fallback to a different
+ * device tree option of chosen/bootargs-override. This is
+ * helpful on boards where u-boot sets bootargs, and is unable
+ * to be modified.
+ */
+#ifdef CONFIG_CMDLINE_OVERRIDE
+ p = of_get_flat_dt_prop(node, "bootargs-override", &l);
+ if (p != NULL && l > 0)
+ strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
+#endif
+
/*
* CONFIG_CMDLINE is meant to be a default in case nothing else
* managed to set the command line, unless CONFIG_CMDLINE_FORCE