Re: [PATCH] arm64:renesas: Introduce early console for Salvator-X board

[Dirk Behme <dirk.behme@gmail.com>]

On 08.11.2016 15:30, Julien Grall wrote:
> Hello Iurii,
>
> Dirk (in CC) sent a similar patch few months ago to add support for
> this board (see [1]).
>
> I didn't ack the patch back then because I wanted to see documentation
> on the wiki to bring up Xen on this board (see [2] for the
> requirements). I didn't see any follow-up since then for this board.
>
> Can one of you write a documentation for this board


Yes, that would be nice.

As mentioned, I couldn't find an 'easy' way to load Xen without 
modifying the firmware (U-Boot or ATF) or using a JTAG debugger. 
Therefore I hesitated to write that documentation.

Maybe Iurii found an easier, more user compatible way?

Best regards

Dirk


and take
> "ownership" on this board?
>
> Regards,
>
> [1]
> https://lists.xenproject.org/archives/html/xen-devel/2016-07/msg00315.html
>
> [2]
> https://lists.xenproject.org/archives/html/xen-devel/2016-07/msg00130.html
>
>
> On 08/11/2016 14:20, Iurii Mykhalskyi wrote:
>> From: Iurii Konovalenko <iurii.konovalenko@globallogic.com>
>>
>> Add support for the "Salvator-X" development board based on R-Car H3
>> SoC
>> which has SCIF compatible UART.
>>
>> Signed-off-by: Iurii Konovalenko <iurii.konovalenko@globallogic.com>
>> Signed-off-by: Iurii Mykhalskyi <iurii.mykhalskyi@globallogic.com>
>> ---
>>  xen/arch/arm/Rules.mk             |  1 +
>>  xen/arch/arm/arm64/debug-scif.inc | 51
>> +++++++++++++++++++++++++++++++++++++++
>>  2 files changed, 52 insertions(+)
>>  create mode 100644 xen/arch/arm/arm64/debug-scif.inc
>>
>> diff --git a/xen/arch/arm/Rules.mk b/xen/arch/arm/Rules.mk
>> index 569a0ba..7989634 100644
>> --- a/xen/arch/arm/Rules.mk
>> +++ b/xen/arch/arm/Rules.mk
>> @@ -34,6 +34,7 @@ EARLY_PRINTK_fastmodel      :=
>> pl011,0x1c090000,115200
>>  EARLY_PRINTK_exynos5250     := exynos4210,0x12c20000
>>  EARLY_PRINTK_juno           := pl011,0x7ff80000
>>  EARLY_PRINTK_lager          := scif,0xe6e60000
>> +EARLY_PRINTK_salvator       := scif,0xe6e88000
>>  EARLY_PRINTK_midway         := pl011,0xfff36000
>>  EARLY_PRINTK_omap5432       := 8250,0x48020000,2
>>  EARLY_PRINTK_seattle        := pl011,0xe1010000
>> diff --git a/xen/arch/arm/arm64/debug-scif.inc
>> b/xen/arch/arm/arm64/debug-scif.inc
>> new file mode 100644
>> index 0000000..1f4d657
>> --- /dev/null
>> +++ b/xen/arch/arm/arm64/debug-scif.inc
>> @@ -0,0 +1,51 @@
>> +/*
>> + * xen/arch/arm/arm64/debug-scif.inc
>> + *
>> + * SCIF specific debug code
>> + *
>> + * Oleksandr Tyshchenko <oleksandr.tyshchenko@globallogic.com>
>> + * Iurii Konovalenko <iurii.konovalenko@globallogic.com>
>> + * Iurii Mykhalskyi <iurii.mykhalskyi@globallogic.com>
>> + * Copyright (C) 2014-2016, Globallogic.
>> + *
>> + * This program is free software; you can redistribute it and/or
>> modify
>> + * it under the terms of the GNU General Public License as
>> published by
>> + * the Free Software Foundation; either version 2 of the License, or
>> + * (at your option) any later version.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <asm/scif-uart.h>
>> +
>> +/* SCIF UART wait UART to be ready to transmit
>> + * rb: register which contains the UART base address
>> + * rc: scratch register
>> + */
>> +.macro early_uart_ready xb c
>> +1:
>> +        ldrh   w\c, [\xb, #SCIF_SCFSR]   /* <- SCFSR (status
>> register) */
>> +        tst    w\c, #SCFSR_TDFE          /* Check TDFE bit */
>> +        beq    1b                        /* Wait for the UART to be
>> ready */
>> +.endm
>> +
>> +/* SCIF UART transmit character
>> + * rb: register which contains the UART base address
>> + * rt: register which contains the character to transmit
>> + */
>> +.macro early_uart_transmit xb wt
>> +        strb   \wt, [\xb, #SCIF_SCFTDR]                  /* ->
>> SCFTDR (data register) */
>> +        ldrh   \wt, [\xb, #SCIF_SCFSR]                   /* <-
>> SCFSR (status register) */
>> +        and    \wt, \wt, #(~(SCFSR_TEND | SCFSR_TDFE))   /* Clear
>> TEND and TDFE bits */
>> +        strh   \wt, [\xb, #SCIF_SCFSR]                   /* ->
>> SCFSR (status register) */
>> +.endm
>> +
>> +/*
>> + * Local variables:
>> + * mode: ASM
>> + * indent-tabs-mode: nil
>> + * End:
>> + */
>>
>


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