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sparc: fix leon3 casa instruction when MMU is disabled
Since the commit af7a06b: `casa [..](10), .., ..` (and probably others alternate space instructions) triggers a data access exception when the MMU is disabled. When we enter get_asi(...) dc->mem_idx is set to MMU_PHYS_IDX when the MMU is disabled. Just keep mem_idx unchanged in this case so we passthrough the MMU when it is disabled. Signed-off-by: KONRAD Frederic <frederic.konrad@adacore.com> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
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