On 04/24/2018 08:28 AM, r...@andestech.com wrote:
-----Original Message-----
From: Alexander Graf [mailto:ag...@suse.de]
Sent: Monday, April 23, 2018 2:00 PM
To: u-boot@lists.denx.de
Cc: Rick Jian-Zhi Chen(陳建志); Greentime Hu; Philipp Tomsich; Heinrich
Schuchardt; sch...@suse.de
Subject: [PATCH v3 7/8] riscv: nx25: Enable distro boot
Distro boot allows for a common boot path on systems that allow distributions to
easily boot from a default configuration.
This patch enables distro boot for the nx25-ae250. Hopefully this can serve as a
good example for new boards, so they enable it as well.
Signed-off-by: Alexander Graf <ag...@suse.de>
---
configs/nx25-ae250_defconfig | 1 +
include/configs/nx25-ae250.h | 17 +++++++++++++++++
2 files changed, 18 insertions(+)
diff --git a/configs/nx25-ae250_defconfig b/configs/nx25-ae250_defconfig index
4f9bd58f75..437083231b 100644
--- a/configs/nx25-ae250_defconfig
+++ b/configs/nx25-ae250_defconfig
@@ -37,3 +37,4 @@ CONFIG_DM_SPI=y
CONFIG_ATCSPI200_SPI=y
CONFIG_TIMER=y
CONFIG_ATCPIT100_TIMER=y
+CONFIG_DISTRO_DEFAULTS=y
diff --git a/include/configs/nx25-ae250.h b/include/configs/nx25-ae250.h index
0e4c431cab..a90c75abc4 100644
--- a/include/configs/nx25-ae250.h
+++ b/include/configs/nx25-ae250.h
@@ -105,4 +105,21 @@
/* Increase max gunzip size */
#define CONFIG_SYS_BOOTM_LEN (64 << 20)
+/* When we use RAM as ENV */
+#define CONFIG_ENV_SIZE 0x2000
+
+/* 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
+
Hi Alexander
This default env setting seem try to load something(maybe script, or kernel and
dtb ?) from mmc and tftpserver
But I do not know how to prepare this script or image.
I am not sure if the understanding is correct ?
Can you explain it ?
The distro boot script logic is described quite nicely here:
https://github.com/u-boot/u-boot/blob/master/doc/README.distro
I personally only care about a subset of it though, which is the
efi_loader loading logic:
https://github.com/u-boot/u-boot/blob/master/doc/README.uefi
With distro boot enabled, the distro boot script will automatically
search for a file called /efi/boot/bootriscv64.efi (or 32 respectively)
and execute it as UEFI binary. The next step I need to get to still is
to enable RISC-V UEFI support in grub. Once we have that, we can boot
RISC-V systems like any other platform we support in openSUSE.
Alex
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