Hello, On 10/4/23 18:41, Julien Grall wrote:
> I was asking a pointer to the code in the Device Emulator (QEMU in your > case). I am confident the code is correct in U-boot, because when using > 'w0', the unused bits are meant to be set to zero (per the Arm Arm). But > I am curious to know why QEMU is not doing it. QEMU flow in the case of the read operation should be the following: https://github.com/xen-troops/qemu/blob/v7.0.0-xt/hw/xen/xen-hvm-common.c#L389 https://github.com/xen-troops/qemu/blob/v7.0.0-xt/hw/xen/xen-hvm-common.c#L408 https://github.com/xen-troops/qemu/blob/v7.0.0-xt/hw/xen/xen-hvm-common.c#L309 https://github.com/xen-troops/qemu/blob/v7.0.0-xt/hw/xen/xen-hvm-common.c#L228 https://github.com/xen-troops/qemu/blob/v7.0.0-xt/softmmu/physmem.c#L3002 https://github.com/xen-troops/qemu/blob/v7.0.0-xt/softmmu/physmem.c#L2973 https://github.com/xen-troops/qemu/blob/v7.0.0-xt/softmmu/physmem.c#L2942 https://github.com/xen-troops/qemu/blob/v7.0.0-xt/softmmu/physmem.c#L2926 https://github.com/xen-troops/qemu/blob/v7.0.0-xt/softmmu/physmem.c#L2876 From my understanding, only the quantity of requested bytes is updated. Best regards,
