Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu> says:
This patch series adds basic support for the boards based on Airoha
EN7523/EN7529/EN7562 SoCs. Due to ATF restrictions these boards are
able to run 32-bit OS only.
This patch series adds support for the following hardware:
* console UART
* ethernet controller/switch
* spinand flash (in non-dma mode)
The following issues may be expected:
* Extra slow UBI attaching in U-Boot (up to 20 sec with fastmap enabled).
This is caused by the lack of DMA support in the U-Boot airoha-snfi driver.
* Linux airoha-snfi driver in some cases might damage you flash data
(see: https://lore.kernel.org/lkml/20251012121707.2296160-15-mikhail.kshevetskiy@iopsys.eu/)
* Latest linux kernel is recommended to properly support flashes
with more than one plane per lun
(see: https://lore.kernel.org/lkml/20251012121707.2296160-7-mikhail.kshevetskiy@iopsys.eu/)
* It's NOT recommended to use flashes working in continuous mode because
U-Boot airoha-snfi driver does not support such flashes properly.
The patches was tested on the board:
- SoC: Airoha EN7562
- RAM: 512 MB
- SPI NAND: 4 Gbit, made by Toshiba
- Linux boot: was NOT tested
The U-Boot was chain-loaded from the running U-Boot. Airoha ATF-2.3 does
not allow easily chain-loading of U-Boot from U-Boot, so a special FIT
image (mimic linux kernel) was created
1) Create u-boot.its file with the following contents:
=== cut here ===
/dts-v1/;
/ {
description = "ARM OpenWrt FIT (Flattened Image Tree)";
#address-cells = <1>;
images {
u-boot-ram {
description = "OpenWrt U-Boot RAM image";
data = /incbin/("u-boot.bin.lzma");
type = "kernel";
arch = "arm";
os = "linux";
compression = "lzma";
load = <0x81e00000>;
entry = <0x81e00000>;
hash@1 {
algo = "crc32";
};
hash@2 {
algo = "sha1";
};
};
fdt-1 {
description = "OpenWrt device tree blob";
data = /incbin/("dts/upstream/src/arm/airoha/en7523-evb.dtb");
type = "flat_dt";
arch = "arm";
compression = "none";
hash@1 {
algo = "crc32";
};
hash@2 {
algo = "sha1";
};
};
};
configurations {
default = "config-ram-uboot";
config-ram-uboot {
description = "OpenWrt RAM U-Boot";
kernel = "u-boot-ram";
fdt = "fdt-1";
};
};
};
==================
2) Create u-boot.itb image to chain-load new u-boot from the old one
lzma_alone e u-boot.bin u-boot.bin.lzma
mkimage -f u-boot.its u-boot.itb
3) Load new u-boot from the old one
U-Boot> tftpboot u-boot.itb && bootm
Link: https://lore.kernel.org/r/20251101004503.2379529-1-mikhail.kshevetskiy@iopsys.eu
5e5b630eef