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>

2 files changed, 22 insertions, 17 deletions

diff --git a/util/spd_tools/lp4x/README.md b/util/spd_tools/lp4x/README.md
index 0c49dadc4f..e614f259cf 100644
--- a/util/spd_tools/lp4x/README.md
+++ b/util/spd_tools/lp4x/README.md
@@ -168,7 +168,7 @@ Input JSON file requires the following two fields for every memory part:
 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 (spd_1.bin, spd_2.bin, spd_3.bin and so on)
+    SPD files are named (spd_1.hex, spd_2.hex, spd_3.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
@@ -176,11 +176,11 @@ 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, spd_1.bin
-    MEMORY_PART_B, spd_2.bin
-    MEMORY_PART_C, spd_3.bin
-    MEMORY_PART_D, spd_2.bin
-    MEMORY_PART_E, spd_2.bin
+    MEMORY_PART_A, spd_1.hex
+    MEMORY_PART_B, spd_2.hex
+    MEMORY_PART_C, spd_3.hex
+    MEMORY_PART_D, spd_2.hex
+    MEMORY_PART_E, spd_2.hex
     ```
 
 ## Tool 2 - gen_part_id.go
@@ -222,9 +222,9 @@ Sample Makefile.inc:
 ## This is an auto-generated file. Do not edit!!
 
 SPD_SOURCES =
-SPD_SOURCES += spd_1.bin      # ID = 0(0b0000)  Parts = MEMORY_PART_A
-SPD_SOURCES += spd_2.bin      # ID = 1(0b0001)  Parts = MEMORY_PART_B, MEMORY_PART_D
-SPD_SOURCES += spd_3.bin      # ID = 2(0b0010)  Parts = MEMORY_PART_C
+SPD_SOURCES += spd_1.hex      # ID = 0(0b0000)  Parts = MEMORY_PART_A
+SPD_SOURCES += spd_2.hex      # ID = 1(0b0001)  Parts = MEMORY_PART_B, MEMORY_PART_D
+SPD_SOURCES += spd_3.hex      # ID = 2(0b0010)  Parts = MEMORY_PART_C
 ```
 
 ### Note of caution
diff --git a/util/spd_tools/lp4x/gen_spd.go b/util/spd_tools/lp4x/gen_spd.go
index 17388336d1..e63ca8df6f 100644
--- a/util/spd_tools/lp4x/gen_spd.go
+++ b/util/spd_tools/lp4x/gen_spd.go
@@ -3,7 +3,6 @@
 package main
 
 import (
-	"bytes"
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
@@ -638,14 +637,20 @@ 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++ {
-		spd.WriteByte(getSPDByte(i, memAttribs))
+		b := getSPDByte(i, memAttribs)
+
+		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 {
@@ -660,9 +665,9 @@ func dedupeMemoryPart(dedupedParts []*memPart, memPart *memPart) bool {
 }
 
 func generateSPD(memPart *memPart, SPDId int, SPDDirName string) {
-	spd := createSPD(&memPart.Attribs)
-	memPart.SPDFileName = fmt.Sprintf("lp4x-spd-%d.bin", SPDId)
-	ioutil.WriteFile(filepath.Join(SPDDirName, memPart.SPDFileName), spd.Bytes(), 0644)
+	s := createSPD(&memPart.Attribs)
+	memPart.SPDFileName = fmt.Sprintf("lp4x-spd-%d.hex", SPDId)
+	ioutil.WriteFile(filepath.Join(SPDDirName, memPart.SPDFileName), []byte(s), 0644)
 }
 
 func readMemoryParts(memParts *memParts, memPartsFileName string) error {