[openwrt/openwrt] rockchip: fix set default serial_{addr,port} in boot script

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/609deedd87ed66718653a799a68fa3b52da844f7

commit 609deedd87ed66718653a799a68fa3b52da844f7
Author: Tianling Shen <cnsztl at immortalwrt.org>
AuthorDate: Tue Jan 20 10:12:12 2026 +0800

    rockchip: fix set default serial_{addr,port} in boot script
    
    On some SoCs like RK3399, U-Boot no longer export the serial
    address in $stdout variable, it has been changed to something like
    `stdout=serial,vidconsole` since video supported was added. So
    detect $soc variable instead, this also makes the script more clear.
    
    Addtional note: rk3566 is reported as rk3568, rk3582 is reported as
    rk3588 in $soc.
    
    Signed-off-by: Tianling Shen <cnsztl at immortalwrt.org>
    Link: https://github.com/openwrt/openwrt/pull/21610
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 target/linux/rockchip/image/default.bootscript | 28 ++++++++++++++------------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/target/linux/rockchip/image/default.bootscript b/target/linux/rockchip/image/default.bootscript
index 98dd32356b..77d22754b8 100644
--- a/target/linux/rockchip/image/default.bootscript
+++ b/target/linux/rockchip/image/default.bootscript
@@ -1,18 +1,20 @@
 part uuid ${devtype} ${devnum}:2 uuid
 
-if test $stdout = 'serial at 2ad40000' ;
-then serial_addr=',0x2ad40000'; serial_port='ttyS0';
-elif test $stdout = 'serial at fe660000' ;
-then serial_addr=',0xfe660000'; serial_port='ttyS2';
-elif test $stdout = 'serial at feb50000' ;
-then serial_addr=',0xfeb50000'; serial_port='ttyS2';
-elif test $stdout = 'serial at ff130000' ;
-then serial_addr=',0xff130000'; serial_port='ttyS2';
-elif test $stdout = 'serial at ff1a0000' ;
-then serial_addr=',0xff1a0000'; serial_port='ttyS2';
-elif test $stdout = 'serial at ff9f0000' ;
-then serial_addr=',0xff9f0000'; serial_port='ttyS0';
-fi;
+if test $soc = 'rk3308'; then
+	serial_addr=',0xff0c0000'; serial_port='ttyS2';
+elif test $soc = 'rk3328'; then
+	serial_addr=',0xff130000'; serial_port='ttyS2';
+elif test $soc = 'rk3399'; then
+	serial_addr=',0xff1a0000'; serial_port='ttyS2';
+elif test $soc = 'rk3528'; then
+	serial_addr=',0xff9f0000'; serial_port='ttyS0';
+elif test $soc = 'rk3568'; then
+	serial_addr=',0xfe660000'; serial_port='ttyS2';
+elif test $soc = 'rk3576'; then
+	serial_addr=',0x2ad40000'; serial_port='ttyS0';
+elif test $soc = 'rk3588'; then
+	serial_addr=',0xfeb50000'; serial_port='ttyS2';
+fi
 
 setenv bootargs "console=${serial_port},1500000 earlycon=uart8250,mmio32${serial_addr} root=PARTUUID=${uuid} rw rootwait";