topic Dump of the active RCW values on LS1043A in ATF (BL2) source or U-Boot CLI in Layerscape

Dump of the active RCW values on LS1043A in ATF (BL2) source or U-Boot CLI

ts1234 — Mon, 21 Mar 2022 13:58:16 GMT

How do I dump (on UART) the active RCW values on LS1043ARDB, either in ATF (BL2) source or U-Boot CLI?

Re: Dump of the active RCW values on LS1043A in ATF (BL2) source or U-Boot CLI

teddy_gom_e — Tue, 22 Mar 2022 16:43:15 GMT

In U-Boot it is simple, when you boot this is always printed on UART serial port, example :

U-Boot 2020.12 Local build 1.0-dirty (Mar 21 2022 - 15:41:43 +0100) SoC: LS1043AE Rev1.1 (0x87920211) Clock Configuration: CPU0(A53):1200 MHz CPU1(A53):1200 MHz CPU2(A53):1200 MHz CPU3(A53):1200 MHz Bus: 300 MHz DDR: 1300 MT/s FMAN: 400 MHz Reset Configuration Word (RCW): 00000000: 060d000c 0c000000 00000000 00000000 00000010: 35580002 0000801a 40244000 61002000 00000020: 00000000 11100101 00000000 00038ffd 00000030: 00004504 00061000 00000096 00000001

Re: Dump of the active RCW values on LS1043A in ATF (BL2) source or U-Boot CLI

ts1234 — Wed, 23 Mar 2022 18:14:59 GMT

Thank You!

How do I dump the value of a specific RCW field from u-boot CLI?

Re: Dump of the active RCW values on LS1043A in ATF (BL2) source or U-Boot CLI

teddy_gom_e — Thu, 24 Mar 2022 08:00:32 GMT

looking at the Reference manual chapter 13.3.16 Reset Control Word Status Register n : RCW is at register 0x1EE_0100 to 0x1EE_013C

=> md.b 1ee0100 40 01ee0100: 06 0d 00 0c 0c 00 00 00 00 00 00 00 00 00 00 00 ................ 01ee0110: 35 58 00 02 00 00 80 1a 40 04 40 00 61 00 20 00 5X......@.@.a. . 01ee0120: 00 00 00 00 11 10 01 01 00 00 00 00 00 03 8f fd ................ 01ee0130: 20 00 45 00 00 06 10 00 00 00 00 96 00 00 00 01 .E.............

Shown as bytes to have endianness match my previous capture

So you can access each byte directly by calculated register address,

You can check code of u-Boot: arch/arm/cpu/armv8/fsl-layerscape/cpu.c function print_cpuinfo()

/* * Display the RCW, so that no one gets confused as to what RCW * we're actually using for this boot. */ puts("Reset Configuration Word (RCW):"); for (i = 0; i < ARRAY_SIZE(gur->rcwsr); i++) { rcw = gur_in32(&gur->rcwsr[i]); if ((i % 4) == 0) printf("\n %08x:", i * 4); printf(" %08x", rcw); } puts("\n");