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From Paul Brook:

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The ESP SCSI driver currently doesn't check whether a DMA requests has
completed before checking its status. On older qemu versions this
works ok because DMA happens instantly. On never qemu DMA can take an
indeterminate amount of time ooto complete, just like on real
hardware.

The patch waits for the controller to raise the DMA interrupt after
initiating a DMA request.



git-svn-id: svn://coreboot.org/openbios/openbios-devel@73 f158a5a8-5612-0410-a976-696ce0be7e32
This commit is contained in:
Stefan Reinauer
2006-08-12 09:52:34 +00:00
parent 83a3c5d996
commit 8be21e0d3a
1 changed files with 4 additions and 0 deletions
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4
drivers/esp.c
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@@ -113,6 +113,8 @@ do_command(esp_private_t *esp, sd_private_t *sd, int cmdlen, int replylen)
esp->espdma.regs->cond_reg = 0;
// Set ATN, issue command
esp->ll->regs[ESP_CMD] = ESP_CMD_SELA | ESP_CMD_DMA;
// Wait for DMA to complete. Can this fail?
while ((esp->espdma.regs->cond_reg & DMA_HNDL_INTR) == 0) /* no-op */;
// Check status
status = esp->ll->regs[ESP_STATUS];
@@ -129,6 +131,8 @@ do_command(esp_private_t *esp, sd_private_t *sd, int cmdlen, int replylen)
esp->espdma.regs->cond_reg = DMA_ST_WRITE;
// Transfer
esp->ll->regs[ESP_CMD] = ESP_CMD_TI | ESP_CMD_DMA;
// Wait for DMA to complete
while ((esp->espdma.regs->cond_reg & DMA_HNDL_INTR) == 0) /* no-op */;
// Check status
status = esp->ll->regs[ESP_STATUS];