Perform the length adjustment whereby a value of 0 in the STC represents a transfer length of 0x10000 at the point where the TC is loaded at the start of a DMA command rather than just when a TI (Transfer Information) command is executed. This better matches the description as given in the datasheet.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayl...@ilande.co.uk> --- hw/scsi/esp.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c index a1acc2c9bd..02b7876394 100644 --- a/hw/scsi/esp.c +++ b/hw/scsi/esp.c @@ -562,9 +562,6 @@ static void handle_ti(ESPState *s) } dmalen = esp_get_tc(s); - if (dmalen == 0) { - dmalen = 0x10000; - } s->dma_counter = dmalen; if (s->do_cmd) { @@ -699,7 +696,11 @@ void esp_reg_write(ESPState *s, uint32_t saddr, uint64_t val) if (val & CMD_DMA) { s->dma = 1; /* Reload DMA counter. */ - esp_set_tc(s, esp_get_stc(s)); + if (esp_get_stc(s) == 0) { + esp_set_tc(s, 0x10000); + } else { + esp_set_tc(s, esp_get_stc(s)); + } } else { s->dma = 0; } -- 2.20.1