K510 U-boot Developer's Guide
Document version: V1.0.0
Published: 2022-03-09
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# preface **Document purpose** This document is a K510 demo board sdk supporting document, mainly introducing uboot related content, such as k510 demo board configuration file, device tree, driver location and other information under uboot.Reader Objects
The main people to whom this document (this guide) applies:
- Software developers
- Technical support personnel
Revision history The revision history accumulates a description of each document update. The latest version of the document contains updates for all previous versions.
| The version number | Modified by | Date of revision | Revision Notes |
|---|---|---|---|
| V1.0.0 | System software groups | 2022-03-09 | |
[TOC]
U-boot is part of sdk, and the u-boot version currently used by the SDK is 2020.01. Uboot is a bootloader program developed by the German DENX group for a variety of embedded CPUs, UBoot not only supports the boot of embedded Linux systems, currently, it also supports NetBSD, VxWorks, QNX, RTEMS, ARTOS, LynxOS embedded operating system. In addition to supporting the PowerPC series of processors, UBoot can also support MIPS, x86, ARM, NIOS, RISICV, etc., the main functions are initializing memory, booting Linux systems, more u-boot introduction, please refer tohttps://www.denx.de/wiki/U-Boot
- operating system
| numbering | Software resources | illustrate |
|---|---|---|
| 1 | Ubuntu | 18.04/20.04 |
- Software environment
The software environment requirements are shown in the following table:
| numbering | Software resources | illustrate |
|---|---|---|
| 1 | K510 SDK |
Download and compile the sdk, the sdk will download the uboot code when compiling, and compile the uboot code. For more information about how to download and compile the SDK, seeK510_SDK_Build_and_Burn_Guide.md
This chapter uses compiled k510_evb_lp3_v1_1_defconfig as an example. The corresponding sdk compilation method is make CONF=k510_evb_lp3_v1_1_defconfig, and the directory after compilation is as follows:
k510_evb_lp3_v1_1_defconfig/build/uboot-custom --- uboot's code and compilation directory;
board/canaan/k510/uboot-sdcard.env--- uboot default environment variable configuration file
k510_evb_lp3_v1_1_defconfig/build/uboot-custom/configs/k510_evb_lp3_v1_1_defconfig --uboot configuration file;
k510_evb_lp3_v1_1_defconfig/build/uboot-custom/arch/riscv/dts/k510_evb_lp3_v1_1.dts---- device tree file;
k510_evb_lp3_v1_1_defconfig/build/uboot-custom/include/configs/k510_evb_lp3_v1_1.h--- header file;
k510_evb_lp3_v1_1_defconfig/images/u-boot_burn.bin ---uboot flashes the firmware
buildroot-2020.02.11/boot/uboot ----buildroot in the compilation script about uboot, generally does not need to be modified;
Configs/k510_evb_lp3_v1_1_defconfig---sdk configuration file, BR2_TARGET_UBOOT_BOARD_DEFCONFIG specify the configuration file of uboot;
_start(arch/riscv/cpu/start. S, line 43)
board_init_f(common/board_f.c, line 1013)
board_init_r(common/board_r.c, line 845)
run_main_loop(common/board_r.c, line 637)
board/Canaan/k510_evb_lp3/ddr_init.c
drivers/net/macb.c
Device Tree:
ethernet@93030000 {
compatible = "cdns,macb";
reg = <0x0 0x93030000 0x0 0x10000>;
phy-mode = "rmii";
interrupts = <0x36 0x4>;
interrupt-parent = <0x4>;
clocks = <0x5 0x5>;
clock-names = "hclk", "pclk";
};
drivers/serial/ns16550.c
Device Tree:
serial@96000000 {
compatible = "andestech,uart16550", "ns16550a";
reg = <0x0 0x96000000 0x0 0x1000>;
interrupts = <0x19 0x4>;
clock-frequency = <0x17d7840>;
reg-shift = <0x2>;
reg-io-width = <0x4>;
no-loopback-test = <0x1>;
interrupt-parent = <0x4>;
};
drivers/pinctrl/pinctrl-single.c
Device Tree:
iomux@97040000 {
compatible = "pinctrl-single";
reg = <0x0 0x97040000 0x0 0x10000>;
#address-cells = <0x1>;
#size-cells = <0x0>;
#pinctrl-cells = <0x1>;
pinctrl-single,register-width = <0x20>;
pinctrl-single,function-mask = <0xffffffff>;
pinctrl-names = "default";
pinctrl-0 = <0x6 0x7 0x8 0x9 0xa>;
iomux_uart0_pins {
pinctrl-single,pins = <0x1c0 0x540ca8 0x1c4 0x5a0c69>;
phandle = <0x6>;
};
iomux_emac_pins {
pinctrl-single,pins = <0x8c 0x4e 0x90 0xce 0x88 0x8e 0x98 0x4e 0x80 0x8e 0xb8 0x4e 0xb4 0x4e 0xa8 0x8e 0xa4 0x8e 0x74 0x8e>;
phandle = <0x7>;
};
iomux_spi0_pins {
pinctrl-single,pins = <0x158 0x4e 0x15c 0x4e 0x160 0xce 0x164 0xce 0x168 0xce 0x16c 0xce 0x170 0xce 0x174 0xce 0x178 0xce 0x17c 0xce 0x180 0x8e>;
phandle = <0x8>;
};
iomux_mmc0_pins {
pinctrl-single,pins = <0x1c 0x4e 0x20 0xce 0x24 0xce 0x28 0xce 0x2c 0xce 0x30 0xce 0x34 0xce 0x38 0xce 0x3c 0xce 0x40 0xce>;
phandle = <0x9>;
};
iomux_mmc2_pins {
pinctrl-single,pins = <0x5c 0x4e 0x60 0xce 0x64 0xce 0x68 0xce 0x6c 0xce 0x70 0xce>;
phandle = <0xa>;
};
};
drivers/mmc/sdhci-cadence.c
Device tree
mmc0@93000000 {
compatible = "socionext,uniphier-sd4hc", "cdns,sd4hc";
reg = <0x0 0x93000000 0x0 0x400>;
interrupts = <0x30 0x4>;
interrupt-parent = <0x4>;
clocks = <0xb 0x4>;
max-frequency = <0xbebc200>;
cap-mmc-highspeed;
bus-width = <0x8>;
};
mmc2@93020000 {
compatible = "socionext,uniphier-sd4hc", "cdns,sd4hc";
reg = <0x0 0x93020000 0x0 0x400>;
interrupts = <0x32 0x4>;
interrupt-parent = <0x4>;
clocks = <0xb 0x4>;
max-frequency = <0xbebc200>;
cap-sd-highspeed;
bus-width = <0x1>;
};
The default environment variable for uboot is in the SDK's board/canaan/k510 directory, predefined as a text file:
uboot-emmc.env
uboot-nfs.env
uboot-sdcard.env
The POST script of the SDK will call mkenvimage at compile time to compile the text environment variable definition into a binary image that uboot can load and place in the boot partition.
Here are some examples:
uboot-sdcard.env
bootm_size=0x2000000
bootdelay=3
stderr=serial@96000000
stdin=serial@96000000
stdout=serial@96000000
arch=riscv
baudrate=115200
ipaddr=10.100.226.221
netmask=255.255.255.0
gatewayip=10.100.226.254
serverip=10.100.226.63
bootargs=root=/dev/mmcblk1p2 rw console=ttyS0,115200n8 debug loglevel=7
bootcmd=fatload mmc 1:1 0x600000 bootm-bbl.img;fatload mmc 1:1 0x2000000 k510.dtb;bootm 0x600000 - 0x2000000
bootcmd_nfs=tftp 0x600000 bootm-bbl.img;tftp 0x2000000 k510_nfsroot.dtb;bootm 0x600000 - 0x2000000
Note: The kernel boot parameter bootargs are set by the default environment variable of uboot, and the bootargs in dts will be overwritten. See FAQ - Where did bootargs get and pass to the kernel?
The sdk image already contains a uboot program, directly flashing the sdk image, such as: k510_evb_lp3_v1_1_defconfig/images/sysimage-sdcard.img file
Put the u-boot_burn.bin file in the tftp directory, configure the ip address of the device Network port, and enter the /root/sd/p1 directory; Execute the tftp -gr u-boot_burn.bin xxx.xxx.xxx.xxx.xx command;
Put the u-boot_burn.bin file in the tftp directory, configure the device's network port IP address, and download the file to the device via tftp -gr u-boot_burn.bin xxx.xxx.xxx.xxx.xx;
Execute the dd if=u-boot_burn.bin of=/dev/mmcblk0p1 command to write the file to the mmc card.
A: At present, the EVB can only run 800, and the CRB can set 800 or 1600. CrB board ddr frequency setting method see uboot board\Canaan\k510_crb_lp3\ddr_param.h file, 800M corresponds to #define DDR_800 1, 1600M corresponds to #define DDR_1600 1.
A: Obtained from the uboot environment variable bootargs, uboot will modify the bootargs parameters in the memory device tree according to the bootargs environment variable value when booting the kernel. The relevant code is as follows:
int fdt_chosen(void *fdt)
{
int nodeoffset;
int err;
char *str; /* used to set string properties */
err = fdt_check_header(fdt);
if (err < 0) {
printf("fdt_chosen: %s\n", fdt_strerror(err));
return err;
}
/* find or create "/chosen" node. */
nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
if (nodeoffset < 0)
return nodeoffset;
str = env_get("bootargs");
if (str) {
err = fdt_setprop(fdt, nodeoffset, "bootargs", str,
strlen(str) + 1);
if (err < 0) {
printf("WARNING: could not set bootargs %s.\n",
fdt_strerror(err));
return err;
}
}
return fdt_fixup_stdout(fdt, nodeoffset);
}A: uboot dynamically obtains the environment variables according to the boot mode, and updates the device tree in memory according to the bootargs environment variables when booting the kernel. After the modified boot parameters, see the /sys/firmware/devicetree/base/chosen node.
Answer:
| Startup mode | uboot read and save location | Compile-time corresponding files |
|---|---|---|
| EMMC boots | Emmc the uboot-emmc.env file for the second partition | board\canaan\k510\uboot-emmc.env |
| Sd card boot | The uboot-sd.env file of the first partition of the sd card | board\canaan\k510\uboot-sd.env |
A: QOS-related registers are QOS_CTRL0 QOS_CTRL1 QOS_CTRL2 QOS_CTRL3 QOS_CTRL4. Example: After setting qos, nncase demo performance has improved
*(uint32_t *)0x970E00FC = (0x2 << 8) | (0x2 << 12) | (0x2 << 16) | (0x2 << 20) | (0x2 << 24);
*(uint32_t *)0x970E0100 = (0x3 << 4) | 0x3;
*(uint32_t *)0x970E00F4 = (0x5 << 16) | (0x5 << 20);Translation Disclaimer
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