riscv: Enable efi_loader support

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Then I think if I don't want enter this auto flow, what can I do ?

1 Remove CONFIG_DISTRO_DEFAULTS=y from nx25-ae250_defconfig But it still enter auto flow.

2 Add #ifdef CONFIG_DISTRO_DEFAULTS to encapsulate the CONFIG_EXTRA_ENV_SETTINGS in nx25-ae250.h And Remove CONFIG_DISTRO_DEFAULTS=y from nx25-ae250_defconfig And it will NOT enter auto flow

#ifdef CONFIG_DISTRO_DEFAULTS
/* Enable distro boot */
#define BOOT_TARGET_DEVICES(func) \
func(MMC, mmc, 0) \
func(DHCP, dhcp, na)

#include <config_distro_bootcmd.h>

#define CONFIG_EXTRA_ENV_SETTINGS       \
                               "kernel_addr_r=0x00080000\0" \
                               "pxefile_addr_r=0x01f00000\0" \
                               "scriptaddr=0x01f00000\0" \
                               "fdt_addr_r=0x02000000\0" \
                               "ramdisk_addr_r=0x02800000\0" \
                               BOOTENV #endif

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3 Add #ifdef CONFIG_DISTRO_DEFAULTS to encapsulate the CONFIG_EXTRA_ENV_SETTINGS in nx25-ae250.h And do NOT Remove CONFIG_DISTRO_DEFAULTS=y from nx25-ae250_defconfig But disable

CONFIG_DISTRO_DEFAULTS from make menuconfig

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General setup --->
[ ] Select defaults suitable for booting general purpose Linux
distributions And it still enter auto flow

Offering this information for you.

This is the same for all distro enabled boards. The basic idea is that U-Boot ships with something that "just boots" for simple use cases.

If you want something more advanced, you usually want to put something very target specific in there anyway, such as "bootm $nor_flash". In that case, you adapt the CONFIG_BOOTCOMMAND parameter to whatever you want.

The boot command can also be overridden using the environment. So if you have working environment store, you can change the U-Boot variable "bootcmd" and U-Boot will run that instead when it boots.

The alternative to this default behavior would be no bootcmd at all which means you just get dropped into the U-Boot prompt. While that's reasonably useful for developers, it isn't for people deploying U-Boot on real target systems :).

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Alex

Thanks for your advises.

After you send those patchs into main trunk.
I will fetch and push them to u-boot-riscv.git :)