From: Chris Morgan macromorgan@hotmail.com

The pinctrl on the Anbernic RGxx3 for the i2c2 bus does not use the default value, so explicitly define it.

Fixes: 6cf6fe25370c ("board: rockchip: add Anbernic RGXX3 Series Devices") Signed-off-by: Chris Morgan macromorgan@hotmail.com --- arch/arm/dts/rk3566-anbernic-rgxx3-u-boot.dtsi | 2 ++ 1 file changed, 2 insertions(+)

diff --git a/arch/arm/dts/rk3566-anbernic-rgxx3-u-boot.dtsi b/arch/arm/dts/rk3566-anbernic-rgxx3-u-boot.dtsi index a18e5d1cf7..62e75223af 100644 --- a/arch/arm/dts/rk3566-anbernic-rgxx3-u-boot.dtsi +++ b/arch/arm/dts/rk3566-anbernic-rgxx3-u-boot.dtsi @@ -47,6 +47,8 @@ };

&i2c2 { + pinctrl-0 = <&i2c2m1_xfer>; + pinctrl-names = "default"; status = "okay"; };

From: Chris Morgan macromorgan@hotmail.com

Add support for the DSI and DSI-DPHY to U-Boot for the RGxx3. These are needed so we can send a panel ID request to determine which panel is being used.

Signed-off-by: Chris Morgan macromorgan@hotmail.com --- arch/arm/dts/rk3566-anbernic-rgxx3-u-boot.dtsi | 8 ++++++++ 1 file changed, 8 insertions(+)

diff --git a/arch/arm/dts/rk3566-anbernic-rgxx3-u-boot.dtsi b/arch/arm/dts/rk3566-anbernic-rgxx3-u-boot.dtsi index 62e75223af..f986e1941e 100644 --- a/arch/arm/dts/rk3566-anbernic-rgxx3-u-boot.dtsi +++ b/arch/arm/dts/rk3566-anbernic-rgxx3-u-boot.dtsi @@ -46,6 +46,14 @@ <&pmucru CLK_RTC32K_FRAC>; };

+&dsi_dphy0 { + status = "okay"; +}; + +&dsi0 { + status = "okay"; +}; + &i2c2 { pinctrl-0 = <&i2c2m1_xfer>; pinctrl-names = "default";

From: Chris Morgan macromorgan@hotmail.com

Add support for the RG353PS to the Anbernic RGxx3. This device is a slightly pared down version of the RG353P with no eMMC, no touchscreen, and only 1GB of RAM.

Refactor board logic so that all supported devices are defined with ADC values and that future boards can be added by just defining the board values in the device array.

Signed-off-by: Chris Morgan macromorgan@hotmail.com --- board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c | 126 ++++++++++++++------- 1 file changed, 86 insertions(+), 40 deletions(-)

diff --git a/board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c b/board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c index decc46db78..4d3c724b9c 100644 --- a/board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c +++ b/board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c @@ -7,24 +7,30 @@ #include <adc.h> #include <asm/io.h> #include <dm.h> +#include <dm/lists.h> +#include <env.h> +#include <fdt_support.h> #include <linux/delay.h> +#include <mmc.h> #include <pwm.h> #include <rng.h> #include <stdlib.h> -#include <mmc.h> -#include <env.h>

#define GPIO0_BASE 0xfdd60000 +#define GPIO_SWPORT_DR_L 0x0000 #define GPIO_SWPORT_DR_H 0x0004 +#define GPIO_SWPORT_DDR_L 0x0008 #define GPIO_SWPORT_DDR_H 0x000c -#define GPIO_A5 BIT(5) -#define GPIO_A6 BIT(6) +#define GPIO_C5 BIT(5) +#define GPIO_C6 BIT(6) +#define GPIO_C7 BIT(7)

#define GPIO_WRITEMASK(bits) ((bits) << 16)

#define DTB_DIR "rockchip/"

struct rg3xx_model { + const u16 adc_value; const char *board; const char *board_name; const char *fdtfile; @@ -34,49 +40,64 @@ enum rgxx3_device_id { RG353M, RG353P, RG353V, - RG353VS, RG503, + /* Devices with duplicate ADC value */ + RG353PS, + RG353VS, };

static const struct rg3xx_model rg3xx_model_details[] = { [RG353M] = { + 517, /* Observed average from device */ "rk3566-anbernic-rg353m", "RG353M", - DTB_DIR "rk3566-anbernic-rg353m.dtb", + DTB_DIR "rk3566-anbernic-rg353p.dtb", /* Identical devices */ }, [RG353P] = { + 860, /* Documented value of 860 */ "rk3566-anbernic-rg353p", "RG353P", DTB_DIR "rk3566-anbernic-rg353p.dtb", }, [RG353V] = { + 695, /* Observed average from device */ "rk3566-anbernic-rg353v", "RG353V", DTB_DIR "rk3566-anbernic-rg353v.dtb", }, - [RG353VS] = { - "rk3566-anbernic-rg353vs", - "RG353VS", - DTB_DIR "rk3566-anbernic-rg353vs.dtb", - }, [RG503] = { + 1023, /* Observed average from device */ "rk3566-anbernic-rg503", "RG503", DTB_DIR "rk3566-anbernic-rg503.dtb", }, + /* Devices with duplicate ADC value */ + [RG353PS] = { + 860, /* Observed average from device */ + "rk3566-anbernic-rg353ps", + "RG353PS", + DTB_DIR "rk3566-anbernic-rg353ps.dtb", + }, + [RG353VS] = { + 695, /* Gathered from second hand information */ + "rk3566-anbernic-rg353vs", + "RG353VS", + DTB_DIR "rk3566-anbernic-rg353vs.dtb", + }, };

/* * Start LED very early so user knows device is on. Set color - * to amber. + * to red. */ void spl_board_init(void) { - /* Set GPIO0_A5 and GPIO0_A6 to output. */ - writel(GPIO_WRITEMASK(GPIO_A6 | GPIO_A5) | (GPIO_A6 | GPIO_A5), + /* Set GPIO0_C5, GPIO0_C6, and GPIO0_C7 to output. */ + writel(GPIO_WRITEMASK(GPIO_C7 | GPIO_C6 | GPIO_C5) | \ + (GPIO_C7 | GPIO_C6 | GPIO_C5), (GPIO0_BASE + GPIO_SWPORT_DDR_H)); - /* Set GPIO0_A5 to 0 and GPIO0_A6 to 1. */ - writel(GPIO_WRITEMASK(GPIO_A6 | GPIO_A5) | GPIO_A6, + /* Set GPIO0_C5 and GPIO_C6 to 0 and GPIO0_C7 to 1. */ + writel(GPIO_WRITEMASK(GPIO_C7 | GPIO_C6 | GPIO_C5) | GPIO_C7, (GPIO0_BASE + GPIO_SWPORT_DR_H)); }

@@ -129,12 +150,12 @@ void __maybe_unused startup_buzz(void) /* Detect which Anbernic RGXX3 device we are using so as to load the * correct devicetree for Linux. Set an environment variable once * found. The detection depends on the value of ADC channel 1, the - * presence of an eMMC on mmc0, and querying the DSI panel (TODO). + * presence of an eMMC on mmc0, and querying the DSI panel. */ int rgxx3_detect_device(void) { u32 adc_info; - int ret; + int ret, i; int board_id = -ENXIO; struct mmc *mmc;

@@ -144,30 +165,37 @@ int rgxx3_detect_device(void) return ret; }

- /* Observed value 517. */ - if (adc_info > 505 && adc_info < 530) - board_id = RG353M; - /* Observed value 695. */ - if (adc_info > 680 && adc_info < 710) - board_id = RG353V; - /* Documented value 860. */ - if (adc_info > 850 && adc_info < 870) - board_id = RG353P; - /* Observed value 1023. */ - if (adc_info > 1010) - board_id = RG503; + /* + * Get the correct device from the table. The ADC value is + * determined by a resistor on ADC channel 0. The hardware + * design calls for no more than a 1% variance on the + * resistor, so assume a +- value of 15 should be enough. + */ + for (i = 0; i < ARRAY_SIZE(rg3xx_model_details); i++) { + u32 adc_min = rg3xx_model_details[i].adc_value - 15; + u32 adc_max = rg3xx_model_details[i].adc_value + 15; + + if (adc_min < adc_info && adc_max > adc_info) { + board_id = i; + break; + } + }

/* - * Try to access the eMMC on an RG353V. If it's missing, it's - * an RG353VS. Note we could also check for a touchscreen at - * 0x1a on i2c2. + * Try to access the eMMC on an RG353V or RG353P. If it's + * missing, it's an RG353VS or RG353PS. Note we could also + * check for a touchscreen at 0x1a on i2c2. */ - if (board_id == RG353V) { + if (board_id == RG353V || board_id == RG353P) { mmc = find_mmc_device(0); if (mmc) { ret = mmc_init(mmc); - if (ret) - board_id = RG353VS; + if (ret) { + if (board_id == RG353V) + board_id = RG353VS; + else + board_id = RG353PS; + } } }

@@ -186,18 +214,36 @@ int rk_board_late_init(void) { int ret;

- /* Turn off orange LED and turn on green LED. */ - writel(GPIO_WRITEMASK(GPIO_A6 | GPIO_A5) | GPIO_A5, - (GPIO0_BASE + GPIO_SWPORT_DR_H)); - ret = rgxx3_detect_device(); if (ret) { printf("Unable to detect device type: %d\n", ret); return ret; }

+ /* Turn off red LED and turn on orange LED. */ + writel(GPIO_WRITEMASK(GPIO_C7 | GPIO_C6 | GPIO_C5) | GPIO_C6, + (GPIO0_BASE + GPIO_SWPORT_DR_H)); + if (IS_ENABLED(CONFIG_DM_PWM)) startup_buzz();

return 0; } + +int ft_board_setup(void *blob, struct bd_info *bd) +{ + char *env; + + /* No fixups necessary for the RG503 */ + env = env_get("board_name"); + if (env && (!strcmp(env, rg3xx_model_details[RG503].board_name))) + return 0; + + /* Change the model name of the RG353M */ + if (env && (!strcmp(env, rg3xx_model_details[RG353M].board_name))) + fdt_setprop(blob, 0, "model", + rg3xx_model_details[RG353M].board_name, + sizeof(rg3xx_model_details[RG353M].board_name)); + + return 0; +}

From: Chris Morgan macromorgan@hotmail.com

Add support to automatically detect the panel for the Anbernic RGxx3. This is done by creating a "pseudo driver" that provides only the bare minimum to start the DSI controller and DSI DPHY. Once started, we then can query the panel for its panel ID and compare it to a table of known values. The panel compatible string (which corresponds to the upstream Linux driver) is then defined as an environment variable "panel". The panel compatible string is also changed automatically via an ft_board_setup() call if what is detected differs from what is in the loaded tree. This way, end users can use the same bootloader without having to worry about which panel they have (as there is no obvious way of knowing).

Signed-off-by: Chris Morgan macromorgan@hotmail.com --- board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c | 196 +++++++++++++++++++++ 1 file changed, 196 insertions(+)

diff --git a/board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c b/board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c index 4d3c724b9c..3f1a42d184 100644 --- a/board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c +++ b/board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c @@ -6,21 +6,27 @@ #include <abuf.h> #include <adc.h> #include <asm/io.h> +#include <display.h> #include <dm.h> #include <dm/lists.h> #include <env.h> #include <fdt_support.h> #include <linux/delay.h> +#include <mipi_dsi.h> #include <mmc.h> +#include <panel.h> #include <pwm.h> #include <rng.h> #include <stdlib.h> +#include <video_bridge.h>

#define GPIO0_BASE 0xfdd60000 +#define GPIO4_BASE 0xfe770000 #define GPIO_SWPORT_DR_L 0x0000 #define GPIO_SWPORT_DR_H 0x0004 #define GPIO_SWPORT_DDR_L 0x0008 #define GPIO_SWPORT_DDR_H 0x000c +#define GPIO_A0 BIT(0) #define GPIO_C5 BIT(5) #define GPIO_C6 BIT(6) #define GPIO_C7 BIT(7) @@ -86,6 +92,16 @@ static const struct rg3xx_model rg3xx_model_details[] = { }, };

+struct rg353_panel { + const u16 id; + const char *panel_compat; +}; + +static const struct rg353_panel rg353_panel_details[] = { + { .id = 0x3052, .panel_compat = "newvision,nv3051d"}, + { .id = 0x3821, .panel_compat = "anbernic,rg353v-panel-v2"}, +}; + /* * Start LED very early so user knows device is on. Set color * to red. @@ -147,6 +163,150 @@ void __maybe_unused startup_buzz(void) pwm_set_enable(dev, 0, 0); }

+/* + * Provide the bare minimum to identify the panel for the RG353 + * series. Since we don't have a working framebuffer device, no + * need to init the panel; just identify it and provide the + * clocks so we know what to set the different clock values to. + */ + +static const struct display_timing rg353_default_timing = { + .pixelclock.typ = 24150000, + .hactive.typ = 640, + .hfront_porch.typ = 40, + .hback_porch.typ = 80, + .hsync_len.typ = 2, + .vactive.typ = 480, + .vfront_porch.typ = 18, + .vback_porch.typ = 28, + .vsync_len.typ = 2, + .flags = DISPLAY_FLAGS_HSYNC_HIGH | + DISPLAY_FLAGS_VSYNC_HIGH, +}; + +static int anbernic_rg353_panel_get_timing(struct udevice *dev, + struct display_timing *timings) +{ + memcpy(timings, &rg353_default_timing, sizeof(*timings)); + + return 0; +} + +static int anbernic_rg353_panel_probe(struct udevice *dev) +{ + struct mipi_dsi_panel_plat *plat = dev_get_plat(dev); + + plat->lanes = 4; + plat->format = MIPI_DSI_FMT_RGB888; + plat->mode_flags = MIPI_DSI_MODE_VIDEO | + MIPI_DSI_MODE_VIDEO_BURST | + MIPI_DSI_MODE_EOT_PACKET | + MIPI_DSI_MODE_LPM; + + return 0; +} + +static const struct panel_ops anbernic_rg353_panel_ops = { + .get_display_timing = anbernic_rg353_panel_get_timing, +}; + +U_BOOT_DRIVER(anbernic_rg353_panel) = { + .name = "anbernic_rg353_panel", + .id = UCLASS_PANEL, + .ops = &anbernic_rg353_panel_ops, + .probe = anbernic_rg353_panel_probe, + .plat_auto = sizeof(struct mipi_dsi_panel_plat), +}; + +int rgxx3_detect_display(void) +{ + struct udevice *dev; + struct mipi_dsi_device *dsi; + struct mipi_dsi_panel_plat *mplat; + const struct rg353_panel *panel; + int ret = 0; + int i; + u8 panel_id[2]; + + /* + * Take panel out of reset status. + * Set GPIO4_A0 to output. + */ + writel(GPIO_WRITEMASK(GPIO_A0) | GPIO_A0, + (GPIO4_BASE + GPIO_SWPORT_DDR_L)); + /* Set GPIO4_A0 to 1. */ + writel(GPIO_WRITEMASK(GPIO_A0) | GPIO_A0, + (GPIO4_BASE + GPIO_SWPORT_DR_L)); + + /* Probe the DSI controller. */ + ret = uclass_get_device_by_name(UCLASS_VIDEO_BRIDGE, + "dsi@fe060000", &dev); + if (ret) { + printf("DSI host not probed: %d\n", ret); + return ret; + } + + /* Probe the DSI panel. */ + ret = device_bind_driver_to_node(dev, "anbernic_rg353_panel", + "anbernic_rg353_panel", + dev_ofnode(dev), NULL); + if (ret) { + printf("Failed to probe RG353 panel: %d\n", ret); + return ret; + } + + /* + * Attach the DSI controller which will also probe and attach + * the DSIDPHY. + */ + ret = video_bridge_attach(dev); + if (ret) { + printf("Failed to attach DSI controller: %d\n", ret); + return ret; + } + + /* + * Get the panel which should have already been probed by the + * video_bridge_attach() function. + */ + ret = uclass_first_device_err(UCLASS_PANEL, &dev); + if (ret) { + printf("Panel device error: %d\n", ret); + return ret; + } + + /* Now call the panel via DSI commands to get the panel ID. */ + mplat = dev_get_plat(dev); + dsi = mplat->device; + mipi_dsi_set_maximum_return_packet_size(dsi, sizeof(panel_id)); + ret = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_DISPLAY_ID, &panel_id, + sizeof(panel_id)); + if (ret < 0) { + printf("Unable to read panel ID: %d\n", ret); + return ret; + } + + /* Get the correct panel compatible from the table. */ + for (i = 0; i < ARRAY_SIZE(rg353_panel_details); i++) { + if (rg353_panel_details[i].id == ((panel_id[0] << 8) | + panel_id[1])) { + panel = &rg353_panel_details[i]; + break; + } + } + + if (!panel) { + printf("Unable to identify panel_id %x\n", + (panel_id[0] << 8) | panel_id[1]); + env_set("panel", "unknown"); + return -EINVAL; + } + + env_set("panel", panel->panel_compat); + + return 0; +} + /* Detect which Anbernic RGXX3 device we are using so as to load the * correct devicetree for Linux. Set an environment variable once * found. The detection depends on the value of ADC channel 1, the @@ -207,6 +367,14 @@ int rgxx3_detect_device(void) rg3xx_model_details[board_id].board_name); env_set("fdtfile", rg3xx_model_details[board_id].fdtfile);

+ /* Detect the panel type for any device that isn't a 503. */ + if (board_id == RG503) + return 0; + + ret = rgxx3_detect_display(); + if (ret) + return ret; + return 0; }

@@ -232,6 +400,7 @@ int rk_board_late_init(void)

int ft_board_setup(void *blob, struct bd_info *bd) { + int node, ret; char *env;

/* No fixups necessary for the RG503 */ @@ -245,5 +414,32 @@ int ft_board_setup(void *blob, struct bd_info *bd) rg3xx_model_details[RG353M].board_name, sizeof(rg3xx_model_details[RG353M].board_name));

+ /* + * Check if the environment variable doesn't equal the panel. + * If it doesn't, update the devicetree to the correct panel. + */ + node = fdt_path_offset(blob, "/dsi@fe060000/panel@0"); + if (!(node > 0)) { + printf("Can't find the DSI node\n"); + return -ENODEV; + } + + env = env_get("panel"); + if (!env) { + printf("Can't get panel env\n"); + return -ENODEV; + } + + ret = fdt_node_check_compatible(blob, node, env); + if (ret < 0) + return -ENODEV; + + /* Panels match, return 0. */ + if (!ret) + return 0; + + do_fixup_by_path_string(blob, "/dsi@fe060000/panel@0", + "compatible", env); + return 0; }

From: Chris Morgan macromorgan@hotmail.com

Update the anbernic-rgxx3_defconfig file to support panel autodetection and automatically updating the compatible string in the devicetree.

Signed-off-by: Chris Morgan macromorgan@hotmail.com --- configs/anbernic-rgxx3_defconfig | 15 +++++++++++++++ 1 file changed, 15 insertions(+)

diff --git a/configs/anbernic-rgxx3_defconfig b/configs/anbernic-rgxx3_defconfig index b17e917914..ed6643d9d4 100644 --- a/configs/anbernic-rgxx3_defconfig +++ b/configs/anbernic-rgxx3_defconfig @@ -12,6 +12,7 @@ CONFIG_DEFAULT_DEVICE_TREE="rk3566-anbernic-rgxx3" CONFIG_ROCKCHIP_RK3568=y CONFIG_SPL_ROCKCHIP_BACK_TO_BROM=y CONFIG_SPL_ROCKCHIP_COMMON_BOARD=y +CONFIG_ROCKCHIP_RK8XX_DISABLE_BOOT_ON_POWERON=y CONFIG_SPL_MMC=y CONFIG_SPL_SERIAL=y CONFIG_SPL_STACK_R_ADDR=0x600000 @@ -24,9 +25,13 @@ CONFIG_DEBUG_UART=y CONFIG_FIT=y CONFIG_FIT_VERBOSE=y CONFIG_SPL_LOAD_FIT=y +CONFIG_OF_BOARD_SETUP=y +CONFIG_OF_STDOUT_VIA_ALIAS=y CONFIG_DEFAULT_FDT_FILE="rockchip/rk3566-anbernic-rgxx3.dtb" +# CONFIG_CONSOLE_MUX is not set # CONFIG_DISPLAY_CPUINFO is not set CONFIG_DISPLAY_BOARDINFO_LATE=y +CONFIG_BOARD_RNG_SEED=y CONFIG_SPL_MAX_SIZE=0x20000 CONFIG_SPL_PAD_TO=0x7f8000 CONFIG_SPL_HAS_BSS_LINKER_SECTION=y @@ -41,6 +46,7 @@ CONFIG_CMD_PWM=y CONFIG_CMD_GPT=y CONFIG_CMD_MMC=y # CONFIG_CMD_SETEXPR is not set +# CONFIG_CMD_CLS is not set # CONFIG_SPL_DOS_PARTITION is not set CONFIG_SPL_OF_CONTROL=y CONFIG_OF_LIVE=y @@ -60,6 +66,7 @@ CONFIG_MMC_DW_ROCKCHIP=y CONFIG_MMC_SDHCI=y CONFIG_MMC_SDHCI_SDMA=y CONFIG_MMC_SDHCI_ROCKCHIP=y +CONFIG_PHY_ROCKCHIP_INNO_DSIDPHY=y CONFIG_DM_PMIC=y CONFIG_DM_PMIC_FAN53555=y CONFIG_PMIC_RK8XX=y @@ -69,10 +76,18 @@ CONFIG_REGULATOR_RK8XX=y CONFIG_DM_REGULATOR_SCMI=y CONFIG_PWM_ROCKCHIP=y CONFIG_SPL_RAM=y +# CONFIG_RAM_ROCKCHIP_DEBUG is not set +CONFIG_DM_RNG=y +CONFIG_RNG_ROCKCHIP=y +# CONFIG_RNG_SMCCC_TRNG is not set CONFIG_BAUDRATE=1500000 CONFIG_DEBUG_UART_SHIFT=2 CONFIG_SYS_NS16550_MEM32=y CONFIG_SYSRESET=y +CONFIG_VIDEO=y +CONFIG_VIDEO_ROCKCHIP=y +CONFIG_DISPLAY_ROCKCHIP_DW_MIPI=y +CONFIG_VIDEO_BRIDGE=y CONFIG_REGEX=y CONFIG_ERRNO_STR=y # CONFIG_EFI_LOADER is not set

From: Chris Morgan macromorgan@hotmail.com

Update the Anbernic RGxx3 documentation to note that panel detection has been added and how it works.

Signed-off-by: Chris Morgan macromorgan@hotmail.com --- doc/board/anbernic/rgxx3.rst | 31 ++++++++++++++++++++----------- 1 file changed, 20 insertions(+), 11 deletions(-)

diff --git a/doc/board/anbernic/rgxx3.rst b/doc/board/anbernic/rgxx3.rst index afa7538282..5aa676aa1d 100644 --- a/doc/board/anbernic/rgxx3.rst +++ b/doc/board/anbernic/rgxx3.rst @@ -7,27 +7,36 @@ This allows U-Boot to boot the following Anbernic devices:

- Anbernic RG353M - Anbernic RG353P + - Anbernic RG353PS - Anbernic RG353V - Anbernic RG353VS - Anbernic RG503

The correct device is detected automatically by comparing ADC values -from ADC channel 1. In the event of an RG353V, an attempt is then made -to probe for an eMMC and if it fails the device is assumed to be an -RG353VS. Based on the detected device, the environment variables -"board", "board_name", and "fdtfile" are set to the correct values -corresponding to the board which can be read by a boot script to boot -with the correct device tree. - -Please note that there are some versions of the RG353 devices with -different panels. Panel auto-detection is planned for a later date. +from ADC channel 1. In the event of an RG353V or RG353P, an attempt +is then made to probe for an eMMC and if it fails the device is assumed +to be an RG353VS or RG353PS. Based on the detected device, the +environment variables "board", "board_name", and "fdtfile" are set to +the correct values corresponding to the board which can be read by a +boot script to boot with the correct device tree. If the board detected +is not of type RG503 (which currently has only 1 panel revision) a +panel detect is then performed by probing a "dummy" display on the DSI +bus and then querying the display ID. The display ID is then compared +to a table to get the known compatible string for use in Linux, and +this string is saved as an environment variable of "panel". + +FDT fixups are performed in the event of an RG353M to change the device +name, or in the event the panel detected does not match the devicetree. +This allows Linux to load the correct panel driver without having to +know exactly which panel is used (as there is no user distingushable +way to tell).

Building U-Boot ---------------

.. code-block:: bash

- $ export CROSS_COMPILE=aarch64-none-elf- + $ export CROSS_COMPILE=aarch64-linux-gnu- $ export BL31=../rkbin/bin/rk35/rk3568_bl31_v1.34.elf $ export ROCKCHIP_TPL=../rkbin/bin/rk35/rk3568_ddr_1056MHz_v1.13.bin $ make anbernic-rgxx3_defconfig @@ -40,7 +49,7 @@ Image installation ------------------

Write the ``u-boot-rockchip.bin`` to an SD card offset 32kb from the -start. +start. Please note that eMMC booting has not been tested at this time.

.. code-block:: bash