Revert "util/spd_tools: output binaries instead of hexdumps"

This reverts commit f23794cf04030bb8d1d7ebe0a3634dffd092e2f7.

Reason for revert: This change breaks compatibility if the changes
in CB:44775 are not also included. CB:44775 is still under discussion,
so revert this change to make spd_tools usable again.

Signed-off-by: Rob Barnes <robbarnes@google.com>
Change-Id: I5840a1b895dcbc8b91c76d8b60df2f95b93a4370
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44999
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

3 files changed, 25 insertions, 22 deletions

diff --git a/util/spd_tools/ddr4/README.md b/util/spd_tools/ddr4/README.md
index c78b06ff49..75275441a2 100644
--- a/util/spd_tools/ddr4/README.md
+++ b/util/spd_tools/ddr4/README.md
@@ -171,7 +171,7 @@ string like "9 10 11 12 14".
 This tool generates the following files using the global list of
 memory parts in JSON format as described above:
   * De-duplicated SPDs required for the different memory parts. These
-    SPD files are named (ddr4-spd-1.bin, ddr4-spd-2.bin, and so on)
+    SPD files are named (ddr4-spd-1.hex, ddr4-spd-2.hex, and so on)
     and placed in the directory provided as an input to the tool.
   * CSV file representing which of the deduplicated SPD files is used
     by which memory part. This file is named as
@@ -179,11 +179,11 @@ memory parts in JSON format as described above:
     as an input to the tool along with the generated SPD
     files. Example CSV file:
     ```
-    MEMORY_PART_A, ddr4-spd-1.bin
-    MEMORY_PART_B, ddr4-spd-2.bin
-    MEMORY_PART_C, ddr4-spd-3.bin
-    MEMORY_PART_D, ddr4-spd-2.bin
-    MEMORY_PART_E, ddr4-spd-2.bin
+    MEMORY_PART_A, ddr4-spd-1.hex
+    MEMORY_PART_B, ddr4-spd-2.hex
+    MEMORY_PART_C, ddr4-spd-3.hex
+    MEMORY_PART_D, ddr4-spd-2.hex
+    MEMORY_PART_E, ddr4-spd-2.hex
     ```
 
 ## Tool 2 - gen_part_id.go
@@ -242,10 +242,10 @@ Sample Makefile.inc:
 ## This is an auto-generated file. Do not edit!!
 
 SPD_SOURCES =
-SPD_SOURCES += ddr4-spd-1.bin      # ID = 0(0b0000)  Parts = MEMORY_PART_A
-SPD_SOURCES += ddr4-spd-2.bin      # ID = 1(0b0001)  Parts = MEMORY_PART_B, MEMORY_PART_D
-SPD_SOURCES += ddr4-spd-empty.bin  # ID = 2(0b0010)
-SPD_SOURCES += ddr4-spd-3.bin      # ID = 2(0b0010)  Parts = MEMORY_PART_C
+SPD_SOURCES += ddr4-spd-1.hex      # ID = 0(0b0000)  Parts = MEMORY_PART_A
+SPD_SOURCES += ddr4-spd-2.hex      # ID = 1(0b0001)  Parts = MEMORY_PART_B, MEMORY_PART_D
+SPD_SOURCES += ddr4-spd-empty.hex  # ID = 2(0b0010)
+SPD_SOURCES += ddr4-spd-3.hex      # ID = 2(0b0010)  Parts = MEMORY_PART_C
 ```
 NOTE: Empty entries may be required if there is a gap created by a memory part
 with a fixed id.
diff --git a/util/spd_tools/ddr4/gen_part_id.go b/util/spd_tools/ddr4/gen_part_id.go
index f07e79b45a..135d5c885c 100644
--- a/util/spd_tools/ddr4/gen_part_id.go
+++ b/util/spd_tools/ddr4/gen_part_id.go
@@ -266,7 +266,7 @@ func genMakefile(partIdList []partIds, makefileDirName string) error {
 
 	for i := 0; i < len(partIdList); i++ {
 		if partIdList[i].SPDFileName == "" {
-			s += fmt.Sprintf("SPD_SOURCES += %s ", "ddr4-spd-empty.bin")
+			s += fmt.Sprintf("SPD_SOURCES += %s ", "ddr4-spd-empty.hex")
 			s += fmt.Sprintf("     # ID = %d(0b%04b)\n", i, int64(i))
 		} else {
 			s += fmt.Sprintf("SPD_SOURCES += %s ", partIdList[i].SPDFileName)
diff --git a/util/spd_tools/ddr4/gen_spd.go b/util/spd_tools/ddr4/gen_spd.go
index b60ab03d81..3c8f71a263 100644
--- a/util/spd_tools/ddr4/gen_spd.go
+++ b/util/spd_tools/ddr4/gen_spd.go
@@ -3,7 +3,6 @@
 package main
 
 import (
-	"bytes"
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
@@ -969,8 +968,8 @@ func getSPDByte(index int, memAttribs *memAttributes) byte {
 	return e.constVal
 }
 
-func createSPD(memAttribs *memAttributes) bytes.Buffer {
-	var spd bytes.Buffer
+func createSPD(memAttribs *memAttributes) string {
+	var s string
 
 	for i := 0; i < 512; i++ {
 		var b byte = 0
@@ -978,10 +977,14 @@ func createSPD(memAttribs *memAttributes) bytes.Buffer {
 			b = getSPDByte(i, memAttribs)
 		}
 
-		spd.WriteByte(b)
+		if (i + 1) % 16 == 0 {
+			s += fmt.Sprintf("%02X\n", b)
+		} else {
+			s += fmt.Sprintf("%02X ", b)
+		}
 	}
 
-	return spd
+	return s
 }
 
 func dedupeMemoryPart(dedupedParts []*memPart, memPart *memPart) bool {
@@ -996,16 +999,16 @@ func dedupeMemoryPart(dedupedParts []*memPart, memPart *memPart) bool {
 }
 
 func generateSPD(memPart *memPart, SPDId int, SPDDirName string) {
-	spd := createSPD(&memPart.Attribs)
-	memPart.SPDFileName = fmt.Sprintf("ddr4-spd-%d.bin", SPDId)
-	ioutil.WriteFile(filepath.Join(SPDDirName, memPart.SPDFileName), spd.Bytes(), 0644)
+	s := createSPD(&memPart.Attribs)
+	memPart.SPDFileName = fmt.Sprintf("ddr4-spd-%d.hex", SPDId)
+	ioutil.WriteFile(filepath.Join(SPDDirName, memPart.SPDFileName), []byte(s), 0644)
 }
 
 func generateEmptySPD(SPDDirName string) {
 
-	spd := createSPD(nil)
-	SPDFileName := "ddr4-spd-empty.bin"
-	ioutil.WriteFile(filepath.Join(SPDDirName, SPDFileName), spd.Bytes(), 0644)
+	s := createSPD(nil)
+	SPDFileName := "ddr4-spd-empty.hex"
+	ioutil.WriteFile(filepath.Join(SPDDirName, SPDFileName), []byte(s), 0644)
 }
 
 func readMemoryParts(memParts *memParts, memPartsFileName string) error {