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hw/hppa/machine: Map the PDC memory region with higher priority

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The region in range [0xf0000000 - 0xf1000000] is the PDC area
(Processor Dependent Code), where the firmware is loaded.
This region has higher priority than the main memory.

When the machine has more than 3840MB of RAM, there is an
overlap. Since the PDC is closer to the CPU in the bus
hierarchy, it gets accessed first, and the CPU does not have
access to the RAM in this range.

To model the same behavior and keep a simple memory layout,
reduce the priority of the RAM region. The PDC region ends
overlapping the RAM.

Acked-by: Helge Deller <deller@gmx.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20200109000525.24744-4-f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2020-01-09 01:05:25 +01:00 committed by Richard Henderson
parent b7746b1194
commit 4debfdac03
1 changed files with 1 additions and 1 deletions
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2
hw/hppa/machine.c
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@ -100,7 +100,7 @@ static void machine_hppa_init(MachineState *machine)
ram_region = g_new(MemoryRegion, 1);
memory_region_allocate_system_memory(ram_region, OBJECT(machine),
"ram", ram_size);
memory_region_add_subregion(addr_space, 0, ram_region);
memory_region_add_subregion_overlap(addr_space, 0, ram_region, -1);
/* Init Lasi chip */
lasi_init(addr_space);