add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/scsi/atari_scsi.c
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@@ -714,7 +714,7 @@
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 	.eh_host_reset_handler	= atari_scsi_host_reset,
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 	.this_id		= 7,
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 	.cmd_per_lun		= 2,
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-	.use_clustering		= DISABLE_CLUSTERING,
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+	.dma_boundary		= PAGE_SIZE - 1,
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 	.cmd_size		= NCR5380_CMD_SIZE,
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 };
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..
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@@ -757,15 +757,17 @@
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 	if (setup_hostid >= 0) {
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 		atari_scsi_template.this_id = setup_hostid & 7;
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-	} else {
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+	} else if (IS_REACHABLE(CONFIG_NVRAM)) {
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 		/* Test if a host id is set in the NVRam */
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-		if (ATARIHW_PRESENT(TT_CLK) && nvram_check_checksum()) {
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-			unsigned char b = nvram_read_byte(16);
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+		if (ATARIHW_PRESENT(TT_CLK)) {
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+			unsigned char b;
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+			loff_t offset = 16;
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+			ssize_t count = nvram_read(&b, 1, &offset);
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 			/* Arbitration enabled? (for TOS)
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 			 * If yes, use configured host ID
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 			 */
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-			if (b & 0x80)
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+			if ((count == 1) && (b & 0x80))
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 				atari_scsi_template.this_id = b & 7;
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 		}
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 	}