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docs: Update the fu540 platform guide as per U-Boot documents.

Browse source 
U-Boot readme for fu540 platform suggest that fdt_addr_r should be used
as DT address after DT is copied via tftpboot.

Update the OpenSBI docs to reflect that. Remove other stale informations
as well.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Atish Patra 2019-08-29 15:19:14 -07:00 • committed by Anup Patel
parent 7b7690ed9c
commit 6ed2bc154f
1 changed files with 12 additions and 10 deletions
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22
docs/platform/sifive_fu540.md
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@ -47,11 +47,10 @@ make PLATFORM=sifive/fu540 FW_PAYLOAD_PATH=<linux_build_directory>/arch/riscv/bo
The command-line example here assumes that U-Boot was compiled using the The command-line example here assumes that U-Boot was compiled using the
sifive_fu540_defconfig configuration and with U-Boot v2019.04 (or higher) sifive_fu540_defconfig configuration and with U-Boot v2019.04 (or higher)
having SMP support. having SMP support. From, Linux v5.2 (or higher) device tree is hosted in
Linux kernel and compiled as a part of Linux kernel build process.
To use U-Boot which follows Linux v5.2 (or higher) DT bindings, we will The detailed U-Boot booting guide is avaialble at [U-Boot](https://gitlab.denx.de/u-boot/u-boot/blob/master/doc/board/sifive/fu540.rst)
need custom U-Boot with required driver changes which can be found in
riscv_unleashed_mmc_spi_v2 branch of https://github.com/avpatel/u-boot.git
``` ```
make PLATFORM=sifive/fu540 FW_PAYLOAD_PATH=<u-boot_build_dir>/u-boot.bin make PLATFORM=sifive/fu540 FW_PAYLOAD_PATH=<u-boot_build_dir>/u-boot.bin
@ -174,8 +173,11 @@ already part of the kernel or loaded from an external storage by kernel.
``` ```
tftpboot ${ramdisk_addr_r} <ramdisk path in tftpboot directory> tftpboot ${ramdisk_addr_r} <ramdisk path in tftpboot directory>
``` ```
7. Load the pre-compiled device tree via tftpboot.
7. Set the boot command-line arguments. ```
tftpboot ${fdt_addr_r} <linux source>/arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dtb
```
8. Set the boot command-line arguments.
``` ```
setenv bootargs "root=<root partition> rw console=ttySIF0 earlycon=sbi" setenv bootargs "root=<root partition> rw console=ttySIF0 earlycon=sbi"
``` ```
@ -184,12 +186,12 @@ setenv bootargs "root=<root partition> rw console=ttySIF0 earlycon=sbi"
** root=/dev/mmcblk0pX ** - If a rootfs is already on some other partition ** root=/dev/mmcblk0pX ** - If a rootfs is already on some other partition
of sdcard) of sdcard)
8. Now boot into Linux. 9. Now boot into Linux.
``` ```
bootm ${kernel_addr_r} ${ramdisk_addr_r} ${fdtcontroladdr} bootm ${kernel_addr_r} ${ramdisk_addr_r} ${fdt_addr_r}
or or
(If ramdisk is not loaded from network) (If ramdisk is not loaded from network)
bootm ${kernel_addr_r} - ${fdtcontroladdr} bootm ${kernel_addr_r} - ${fdt_addr_r}
``` ```
**U-Boot & Linux Kernel as a single payload** **U-Boot & Linux Kernel as a single payload**
@ -197,5 +199,5 @@ bootm ${kernel_addr_r} - ${fdtcontroladdr}
At U-Boot prompt execute the following boot command to boot Linux. At U-Boot prompt execute the following boot command to boot Linux.
``` ```
bootm ${kernel_addr_r} - ${fdtcontroladdr} bootm ${kernel_addr_r} - ${fdt_addr_r}
``` ```