How to compile the code for ARM926
1. Download the source code
We provide two source code download addresses, one is github（https://github.com/sunplus-plus1 ) and the other is gitee（https://gitee.com/sunplus-plus1).
2. ARM926 source code location
You download the source code, the directory of arm926 code ：
SP7021/nonos/Bchip-non-os
3. Default Compile
make allThis comand will auto compile all the components(include the arm926), and auto pack the nonos/Bchip-non-os/bin/rom.img to the ISPBOOOT.BIN for EMMC/SPI-Nand to burn .
If you boot by the SD Card or USB Stick, it produced the a926.img(rom.img rename to a926.img)
4. Seperatly Compile the ARM926 code
make nonosThis comand only compile the arm926 code.
5. ARM926 toolchain
Now the arm926 used the gcc toolchain is cross/armv5-eabi--glibc--stable, the toolchain is used for compile linux(the arm926 can run linux).So it can’t use the glibc. You can use the AArch32 bare-metal target (arm-none-eabi), you should download the toolchain(toolchian download link).Then you can modify theTOOLCHAIN_V5_PATH and CROSS_V5_COMPILE varilabes in the bulid/Makefile.
Comments
The PWM module is independent , you use the PWM in the nonos, the linux kernel can’t use it. Now, you develop the DC motors, you can only run B chip only for reducing the complexity.
Now, we are developing the arduino framework for arm926, the project will be completed in July.
Hi
For start PWM I use this three simple command in main.c from Bchip-non-os:
pwm_pinmux_set(0,36);
pwm_set_by_period(0,50000000,25000000);
pwm_enable(0);But it doesn't work. I also added some delay before this start to the test, but in this case the kernel was suspended.
Kernel PWM drivers in .config are completely disabled.
Otherwise, is there any method to disable the boot kernel in SD card mode for the test?
You can change the kernel image file name , so the uboot can’t load the linux kenrel.
Without a kernel, PWM doesn't work anyway. But setting the ports for out (1,0) works as normal. Someone knows what the cause could be?
You can modify the file inux/kernel/arch/arm/mach-pentagram/sp7021.c, Maybe you can directly return the apply_partial_clken() function , try the PWM fucntion is normal . Please try it.
#ifdef CONFIG_SP_PARTIAL_CLKEN
/* power saving, provided by yuwen + CARD_CTL4 */
static void apply_partial_clken(void)
{
int i;
const int ps_clken[] = {
0x67ef, 0x03ff, 0xff03, 0xfff0, 0x0004, /* G0.1~5 */
0x0000, 0x8000, 0xffff, 0x0040, 0x0000, /* G0.6~10 */
};
printk("apply partial clken to save power\n");
for (i = 0; i < sizeof(ps_clken) / 4; i++) {
writel(0xffff0000 | ps_clken[i], (void __iomem *)(B_SYSTEM_BASE + 4 * (1 + i)));
}
}
#endif
Will there be remoteproc support added so the ARM9 can be loaded and run from within Linux?
Yes, the latest version kernel support remoteproc, you can refence the topic https://sunplus.atlassian.net/wiki/spaces/doc/pages/1853816841
Can this core use GPIO/timers/UARTs independently of C7? How to config the mux if so?
I saw only the way to remux to 8051 core. Thanks.
Yes, A926 and CA7 can use device independently. need to pay attention to not conflict between A926 and CA7
GPIO：
#define GPIO_PIN 0 /* config GPIO_P0_0 to gpio mode*/
void gpio_out_test(void)
{
GPIO_F_SET(GPIO_PIN ,1); // enable gpio mode
GPIO_M_SET(GPIO_PIN ,1); // control by gpio
GPIO_E_SET(GPIO_PIN ,1); // 1: output mode ； 0 input mode
GPIO_O_SET(GPIO_PIN ,1); // output 1; GPIO_O_SET(0,0)--> output 0;
}timers:
Bchip-non-os/testapi /util /timer.c Describes how to use timer
STC:
Bchip-non-os/common/ stc.c
uart:
Bchip-non-os/include /emuio.h Describes the uart interface
pinmux config:
#define BAUDRATE 115200
#define XTAL_CLK (27 * 1000 * 1000)
#define UART_SRC_CLK (XTAL_CLK)
/*
* X = ((sclk + baud/2) / baud)
* DIV_H = X >> 12
* DIV_L = (X & 0xf) << 12 | ((X >> 4) & 0xff - 1)
*/
#define UART_BAUD_DIV_H(baud, sclk) ((((sclk) + ((baud) / 2)) / (baud)) >> 12)
#define UART_BAUD_DIV_L(baud, sclk) ((((((sclk) + ((baud) / 2)) / (baud)) & 0xf) << 12) | \
((((((sclk) + ((baud) / 2)) / (baud)) >> 4) & 0xff) - 1))
MOON3_REG->sft_cfg[14] = RF_MASK_V((0x7f << 0), (1 << 0)); /* GPIO_P1_0 uart1 TX*/
MOON3_REG->sft_cfg[14] = RF_MASK_V((0x7f << 8), (2 << 8)); /* GPIO_P1_0 uart1 RX*/
MOON0_REG->reset[1] = RF_MASK_V_CLR(1 << 9); /* release UA1 */
UART1_REG->div_l = UART_BAUD_DIV_L(BAUDRATE, UART_SRC_CLK);
UART1_REG->div_h = UART_BAUD_DIV_H(BAUDRATE, UART_SRC_CLK);Is it possible to shut down the Cortex-A7 cores and use only the ARM926 and 8051 cores to assume a low power mode?
In my proprietary product, we plan to use this core for the driver of DC motors, so we need the ability to control them by PWM and read the signal from the encoders. Basically there is no PWM driver in Bchip-non-os so I copied it from Achip-non-os but unfortunately PWM is not running. It is possible to run / control pwm from this ARM independently of the kernel in the base chip?