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qemu/hw/arm
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Peter Maydell 13edcf591e hw/arm/vexpress-a9: Remove useless mapping of RAM at address 0 
On the vexpress-a9 board we try to map both RAM and flash to address 0,
as seen in "info mtree":

address-space: memory
  0000000000000000-ffffffffffffffff (prio 0, i/o): system
    0000000000000000-0000000003ffffff (prio 0, romd): alias vexpress.flashalias @vexpress.flash0 0000000000000000-0000000003ffffff
    0000000000000000-0000000003ffffff (prio 0, ram): alias vexpress.lowmem @vexpress.highmem 0000000000000000-0000000003ffffff
    0000000010000000-0000000010000fff (prio 0, i/o): arm-sysctl
    0000000010004000-0000000010004fff (prio 0, i/o): pl041
(etc)

The flash "wins" and the RAM mapping is useless (but also harmless).

This happened as a result of commit 6ec1588e in 2014, which changed
"we always map the RAM to the low addresses for vexpress-a9" to "we
always map flash in the low addresses", but forgot to stop mapping
the RAM.

In real hardware, this low part of memory is remappable, both at
runtime by the guest writing to a control register, and configurably
as to what you get out of reset -- you can have the first flash
device, or the second, or the DDR2 RAM, or the external AXI bus
(which for QEMU means "nothing there").  In an ideal world we would
support that remapping both at runtime and via a machine property to
select the out-of-reset behaviour.

Pending anybody caring enough to implement the full remapping
behaviour:
 * remove the useless mapped-but-inaccessible lowram MR
 * document that QEMU doesn't support remapping of low memory

Fixes: 6ec1588e ("hw/arm/vexpress: Alias NOR flash at 0 for vexpress-a9")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1761
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20231103185602.875849-1-peter.maydell@linaro.org
2023-11-06 15:00:29 +00:00
..
allwinner-a10.c hw/arm: Add WDT to Allwinner-A10 and Cubieboard 2023-04-20 10:21:13 +01:00
allwinner-h3.c hw/arm: Add WDT to Allwinner-H3 and Orangepi-PC 2023-04-20 10:21:14 +01:00
allwinner-r40.c hw/arm/allwinner: Clean up local variable shadowing 2023-09-29 10:07:15 +02:00
armsse.c hw/arm/armv7m: Clean up local variable shadowing 2023-09-29 10:07:15 +02:00
armv7m.c target/arm: Move feature test functions to their own header 2023-10-27 11:44:32 +01:00
aspeed.c hw/arm/aspeed: Dynamically allocate AspeedMachineState::soc field 2023-10-25 09:52:44 +02:00
aspeed_ast10x0.c hw/arm/aspeed: Move AspeedSoCState::armv7m to Aspeed10x0SoCState 2023-10-25 09:52:44 +02:00
aspeed_ast2400.c hw/arm/aspeed: Move AspeedSoCState::cpu/vic to Aspeed2400SoCState 2023-10-25 09:52:44 +02:00
aspeed_ast2600.c hw/arm/aspeed: Move AspeedSoCState::a7mpcore to Aspeed2600SoCState 2023-10-25 09:52:44 +02:00
aspeed_eeprom.c hw/arm/aspeed: Add VPD data for Rainier machine 2023-06-15 18:35:57 +02:00
aspeed_eeprom.h hw/arm/aspeed: Add VPD data for Rainier machine 2023-06-15 18:35:57 +02:00
aspeed_soc_common.c hw/arm/aspeed: Check 'memory' link is set in common aspeed_soc_realize 2023-10-25 09:52:44 +02:00
bananapi_m2u.c hw/arm: Avoid using 'first_cpu' when first ARM CPU is reachable 2023-10-27 12:50:12 +01:00
bcm2835_peripherals.c hw/arm/bcm2835_property: Implement "get command line" message 2023-05-02 15:47:40 +01:00
bcm2836.c hw/arm/bcm2835_property: Implement "get command line" message 2023-05-02 15:47:40 +01:00
boot.c target/arm/arm-powerctl: Correctly init CPUs when powered on to lower EL 2023-10-19 14:32:13 +01:00
collie.c *: Add missing includes of qemu/error-report.h 2023-03-22 15:06:57 +00:00
cubieboard.c hw/arm/allwinner-a10: Remove 'hw/arm/boot.h' from header 2023-10-27 12:42:13 +01:00
digic.c arm/digic: replace snprintf() with g_strdup_printf() 2022-04-21 17:03:51 +04:00
digic_boards.c hw/arm: Don't include qemu-common.h unnecessarily 2021-12-15 10:35:26 +00:00
exynos4_boards.c hw/arm: Avoid using 'first_cpu' when first ARM CPU is reachable 2023-10-27 12:50:12 +01:00
exynos4210.c hw/arm: Fix some typos in comments (most found by codespell) 2023-04-20 10:21:13 +01:00
fby35.c hw/arm/aspeed: Move AspeedSoCState::a7mpcore to Aspeed2600SoCState 2023-10-25 09:52:44 +02:00
fsl-imx6.c fsl-imx6: Add SNVS support for i.MX6 boards 2023-05-30 13:02:53 +01:00
fsl-imx6ul.c Add i.MX6UL missing devices. 2023-08-31 09:45:16 +01:00
fsl-imx7.c Add i.MX7 SRC device implementation 2023-08-31 09:45:17 +01:00
fsl-imx25.c Do not include exec/address-spaces.h if it's not really necessary 2021-05-02 17:24:51 +02:00
fsl-imx31.c Do not include cpu.h if it's not really necessary 2021-05-02 17:24:51 +02:00
gumstix.c hw/arm: Remove unreachable code calling pflash_cfi01_register() 2023-01-12 17:03:14 +00:00
highbank.c hw/arm/boot: Drop nb_cpus field from arm_boot_info 2022-02-08 10:56:28 +00:00
imx25_pdk.c hw/arm/fsl-imx25: Remove 'hw/arm/boot.h' from header 2023-10-27 12:42:13 +01:00
integratorcp.c hw/arm: Support machine-default audiodev with fallback 2023-10-03 10:29:39 +02:00
Kconfig hw/arm: xlnx-versal-virt: Add AMD/Xilinx TRNG device 2023-11-02 14:42:03 +00:00
kzm.c hw/arm/fsl-imx31: Remove 'hw/arm/boot.h' from header 2023-10-27 12:42:13 +01:00
mainstone.c hw/arm: Remove unreachable code calling pflash_cfi01_register() 2023-01-12 17:03:14 +00:00
mcimx6ul-evk.c hw/arm/fsl-imx6ul: Remove 'hw/arm/boot.h' from header 2023-10-27 12:42:13 +01:00
mcimx7d-sabre.c hw/arm/fsl-imx7: Remove 'hw/arm/boot.h' from header 2023-10-27 12:42:13 +01:00
meson.build hw/arm/aspeed: Move AspeedSoCState::cpu/vic to Aspeed2400SoCState 2023-10-25 09:52:44 +02:00
microbit.c target/arm: Make boards pass base address to armv7m_load_kernel() 2022-09-14 11:19:40 +01:00
mps2-tz.c hw/arm: Set number of MPU regions correctly for an505, an521, an524 2023-08-31 11:07:02 +01:00
mps2.c hw/char/cmsdk-apb-uart: Open-code cmsdk_apb_uart_create() 2023-02-27 13:27:05 +00:00
msf2-soc.c arm: Remove system_clock_scale global 2021-09-01 11:08:21 +01:00
msf2-som.c tests/avocado: Truncate M2S-FG484 SOM SPI flash to 16MiB 2023-02-07 09:02:04 +01:00
musca.c target/arm: Make boards pass base address to armv7m_load_kernel() 2022-09-14 11:19:40 +01:00
musicpal.c hw/arm: Support machine-default audiodev with fallback 2023-10-03 10:29:39 +02:00
netduino2.c target/arm: Make boards pass base address to armv7m_load_kernel() 2022-09-14 11:19:40 +01:00
netduinoplus2.c target/arm: Make boards pass base address to armv7m_load_kernel() 2022-09-14 11:19:40 +01:00
npcm7xx.c hw/arm: Attach PSPI module to NPCM7XX SoC 2023-02-16 16:00:48 +00:00
npcm7xx_boards.c *: Add missing includes of qemu/error-report.h 2023-03-22 15:06:57 +00:00
nrf51_soc.c arm: Remove system_clock_scale global 2021-09-01 11:08:21 +01:00
nseries.c hw/arm: Support machine-default audiodev with fallback 2023-10-03 10:29:39 +02:00
olimex-stm32-h405.c hw/arm: Add Olimex H405 2023-01-12 16:50:19 +00:00
omap1.c hw/arm: Fix some typos in comments (most found by codespell) 2023-04-20 10:21:13 +01:00
omap2.c audio: propagate Error * out of audio_init 2023-10-03 10:29:40 +02:00
omap_sx1.c *: Add missing includes of qemu/error-report.h 2023-03-22 15:06:57 +00:00
orangepi.c hw/arm: Avoid using 'first_cpu' when first ARM CPU is reachable 2023-10-27 12:50:12 +01:00
palm.c hw/arm: Support machine-default audiodev with fallback 2023-10-03 10:29:39 +02:00
pxa2xx.c hw/arm/pxa2xx: Realize PXA2XX_I2C device before accessing it 2023-10-27 12:48:57 +01:00
pxa2xx_gpio.c hw/arm/pxa2xx_gpio: Pass CPU using QOM link property 2023-11-02 13:36:45 +00:00
pxa2xx_pic.c hw/intc/pxa2xx: Factor pxa2xx_pic_realize() out of pxa2xx_pic_init() 2023-10-27 12:48:57 +01:00
raspi.c hw/arm/raspi: Use arm_write_bootloader() to write boot code 2023-05-02 15:47:41 +01:00
realview.c hw/arm: Avoid using 'first_cpu' when first ARM CPU is reachable 2023-10-27 12:50:12 +01:00
sabrelite.c hw/arm/fsl-imx6: Remove 'hw/arm/boot.h' from header 2023-10-27 12:42:13 +01:00
sbsa-ref.c target/arm: Implement Neoverse N2 CPU model 2023-10-27 11:41:13 +01:00
smmu-common.c hw/arm/smmu: Handle big-endian hosts correctly 2023-07-25 10:56:51 +01:00
smmu-internal.h hw/arm/smmuv3: Add VMID to TLB tagging 2023-05-30 15:50:16 +01:00
smmuv3-internal.h hw/arm/smmuv3: Update ID register bit field definitions 2023-10-19 14:32:13 +01:00
smmuv3.c hw/arm/smmuv3: Advertise SMMUv3.1-XNX feature 2023-10-19 14:32:13 +01:00
spitz.c hw/arm: Support machine-default audiodev with fallback 2023-10-03 10:29:39 +02:00
stellaris.c hw/input/stellaris_gamepad: Convert to qemu_input_handler_register() 2023-11-02 12:52:06 +00:00
stm32f100_soc.c hw/arm/stm32f100: Wire up sysclk and refclk 2021-09-01 11:08:19 +01:00
stm32f205_soc.c hw/arm/stm32f205: Wire up sysclk and refclk 2021-09-01 11:08:19 +01:00
stm32f405_soc.c hw/arm/stm32f405: correctly describe the memory layout 2023-01-12 16:50:18 +00:00
stm32vldiscovery.c target/arm: Make boards pass base address to armv7m_load_kernel() 2022-09-14 11:19:40 +01:00
strongarm.c bulk: Rename TARGET_FMT_plx -> HWADDR_FMT_plx 2023-01-18 11:14:34 +01:00
strongarm.h hw/arm/collie: Create the RAM in the board 2019-10-22 17:44:01 +01:00
tosa.c hw/arm/pxa2xx: Simplify pxa255_init() 2023-01-12 17:03:14 +00:00
trace-events hw/arm/smmuv3: Add stage-2 support in iova notifier 2023-05-30 15:50:16 +01:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
versatilepb.c hw/arm: Support machine-default audiodev with fallback 2023-10-03 10:29:39 +02:00
vexpress.c hw/arm/vexpress-a9: Remove useless mapping of RAM at address 0 2023-11-06 15:00:29 +00:00
virt-acpi-build.c hw/arm/virt: Report correct register sizes in ACPI DBG2/SPCR tables. 2023-11-06 15:00:26 +00:00
virt.c hw/arm/virt: fix PMU IRQ registration 2023-11-06 15:00:26 +00:00
xen_arm.c xen_arm: Initialize RAM and add hi/low memory regions 2023-08-30 18:23:08 -07:00
xilinx_zynq.c hw/arm: Avoid using 'first_cpu' when first ARM CPU is reachable 2023-10-27 12:50:12 +01:00
xlnx-versal-virt.c hw/arm/xlnx-versal: Remove 'hw/arm/boot.h' from header 2023-10-27 12:42:13 +01:00
xlnx-versal.c hw/arm: xlnx-versal-virt: Add AMD/Xilinx TRNG device 2023-11-02 14:42:03 +00:00
xlnx-zcu102.c hw/arm/xlnx-zynqmp: Remove 'hw/arm/boot.h' from header 2023-10-27 12:42:13 +01:00
xlnx-zynqmp.c hw/arm/xlnx-zynqmp: fix unsigned error when checking the RPUs number 2023-05-30 15:50:16 +01:00
z2.c hw/arm: Support machine-default audiodev with fallback 2023-10-03 10:29:39 +02:00