From: Richard Henderson <richard.henderson@linaro.org>
To: "Philippe Mathieu-Daudé" <f4bug@amsat.org>, qemu-devel@nongnu.org
Cc: Peter Maydell <peter.maydell@linaro.org>,
Stephen Checkoway <stephen.checkoway@oberlin.edu>,
qemu-block@nongnu.org,
David Edmondson <david.edmondson@oracle.com>,
qemu-arm@nongnu.org, Antony Pavlov <antonynpavlov@gmail.com>
Subject: Re: [PATCH v2 5/7] hw/arm/digic: Map flash using memory_region_add_subregion_aliased()
Date: Wed, 21 Apr 2021 18:43:50 -0700 [thread overview]
Message-ID: <dec790d2-9fa7-169b-c2c7-2b8ab3ac187d@linaro.org> (raw)
In-Reply-To: <20210419094329.1402767-6-f4bug@amsat.org>
On 4/19/21 2:43 AM, Philippe Mathieu-Daudé wrote:
> Instead of using a device specific feature for mapping the
> flash memory multiple times over a wider region, use the
> generic memory_region_add_subregion_aliased() helper.
>
> There is no change in the memory layout.
>
> * before:
>
> $ qemu-system-arm -M canon-a1100 -S -monitor stdio
> QEMU 5.2.90 monitor - type 'help' for more information
> (qemu) info mtree
> address-space: memory
> 0000000000000000-ffffffffffffffff (prio 0, i/o): system
> 0000000000000000-0000000003ffffff (prio 0, ram): ram
> 00000000c0210000-00000000c02100ff (prio 0, i/o): digic-timer
> 00000000c0210100-00000000c02101ff (prio 0, i/o): digic-timer
> 00000000c0210200-00000000c02102ff (prio 0, i/o): digic-timer
> 00000000c0800000-00000000c0800017 (prio 0, i/o): digic-uart
> 00000000f8000000-00000000ffffffff (prio 0, i/o): pflash
> 00000000f8000000-00000000f83fffff (prio 0, romd): alias pflash-alias @pflash 0000000000000000-00000000003fffff
> 00000000f8400000-00000000f87fffff (prio 0, romd): alias pflash-alias @pflash 0000000000000000-00000000003fffff
> 00000000f8800000-00000000f8bfffff (prio 0, romd): alias pflash-alias @pflash 0000000000000000-00000000003fffff
> ...
> 00000000ff400000-00000000ff7fffff (prio 0, romd): alias pflash-alias @pflash 0000000000000000-00000000003fffff
> 00000000ff800000-00000000ffbfffff (prio 0, romd): alias pflash-alias @pflash 0000000000000000-00000000003fffff
> 00000000ffc00000-00000000ffffffff (prio 0, romd): alias pflash-alias @pflash 0000000000000000-00000000003fffff
>
> * after:
>
> (qemu) info mtree
> address-space: memory
> 0000000000000000-ffffffffffffffff (prio 0, i/o): system
> 0000000000000000-0000000003ffffff (prio 0, ram): ram
> 00000000c0210000-00000000c02100ff (prio 0, i/o): digic-timer
> 00000000c0210100-00000000c02101ff (prio 0, i/o): digic-timer
> 00000000c0210200-00000000c02102ff (prio 0, i/o): digic-timer
> 00000000c0800000-00000000c0800017 (prio 0, i/o): digic-uart
> 00000000f8000000-00000000ffffffff (prio 0, i/o): masked pflash [span of 4 MiB]
> 00000000f8000000-00000000f83fffff (prio 0, romd): alias pflash [#0/32] @pflash 0000000000000000-00000000003fffff
> 00000000f8400000-00000000f87fffff (prio 0, romd): alias pflash [#1/32] @pflash 0000000000000000-00000000003fffff
> 00000000f8800000-00000000f8bfffff (prio 0, romd): alias pflash [#2/32] @pflash 0000000000000000-00000000003fffff
> ...
> 00000000ff400000-00000000ff7fffff (prio 0, romd): alias pflash [#29/32] @pflash 0000000000000000-00000000003fffff
> 00000000ff800000-00000000ffbfffff (prio 0, romd): alias pflash [#30/32] @pflash 0000000000000000-00000000003fffff
> 00000000ffc00000-00000000ffffffff (prio 0, romd): alias pflash [#31/32] @pflash 0000000000000000-00000000003fffff
>
> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> ---
> hw/arm/digic_boards.c | 8 +++++---
> hw/arm/Kconfig | 1 +
> 2 files changed, 6 insertions(+), 3 deletions(-)
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
r~
next prev parent reply other threads:[~2021-04-22 1:47 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-19 9:43 [PATCH v2 0/7] hw/misc: Add memory_region_add_subregion_aliased() helper [pflash part] Philippe Mathieu-Daudé
2021-04-19 9:43 ` [RFC PATCH v2 1/7] hw/misc: Add device to help managing aliased memory regions Philippe Mathieu-Daudé
2021-04-22 1:33 ` Richard Henderson
2021-07-06 21:24 ` Philippe Mathieu-Daudé
2021-04-19 9:43 ` [PATCH v2 2/7] hw/arm/musicpal: Open-code pflash_cfi02_register() call Philippe Mathieu-Daudé
2021-04-22 1:37 ` Richard Henderson
2021-04-19 9:43 ` [PATCH v2 3/7] hw/arm/musicpal: Map flash using memory_region_add_subregion_aliased() Philippe Mathieu-Daudé
2021-04-22 1:41 ` Richard Henderson
2021-04-19 9:43 ` [PATCH v2 4/7] hw/arm/digic: Open-code pflash_cfi02_register() call Philippe Mathieu-Daudé
2021-04-22 1:42 ` Richard Henderson
2021-04-19 9:43 ` [PATCH v2 5/7] hw/arm/digic: Map flash using memory_region_add_subregion_aliased() Philippe Mathieu-Daudé
2021-04-22 1:43 ` Richard Henderson [this message]
2021-04-19 9:43 ` [PATCH v2 6/7] hw/block/pflash_cfi02: Remove pflash_setup_mappings() Philippe Mathieu-Daudé
2021-04-22 1:47 ` Richard Henderson
2021-04-19 9:43 ` [PATCH v2 7/7] hw/block/pflash_cfi02: Simplify pflash_cfi02_register() prototype Philippe Mathieu-Daudé
2021-04-22 1:48 ` Richard Henderson
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